B58 500hp GuidePin
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How to Build a 500HP 40i B58 BMW for Less Than $1,500

Jake Mayock

Meet Jake

Jake currently owns two N54 powered BMW’s – an E60 535i and E82 135i. Jake has 10 years of experience maintaining, repairing, and upgrading his BMW’s. The 135i features a single turbo Precision 6266 conversion capable of 700+whp; Jake completed the entire project on his own. With over 200 automotive articles published, Jake brings a balance of writing skill, hands-on BMW experience, and technical knowledge to the table.

The B58 is the successor to the N54 and N55 engines, both of which were highly tune-able and able to make lots of horsepower with only a handful of supporting mods. The N54 takes the cake in regards to horsepower capabilities, but it had many engine problems as a result. The N55 platform was made more restrictive from a tuning perspective in order to improve engine reliability, which worked well.

While still a relatiely new engine, we’ve certainly seen a massive boom in the B58 aftermarket seen in the past couple of years. In that time, it has proven itself to be one of the most reliable and bulletproof turbocharged engines that BMW has ever made, and it lends itself very well to aftermarket perfromance. Using the same general bolt-on recipe that produced big power on the N54 and N55 engines before it, the B58 is capable of making 500hp, with 450 or so to the wheels with only a handful of supporting mods.

Pre-Tuning Must Do’s: Spark Plugs and Ignition Coils

The B58 has pretty good ignition from the factory, but unless your plugs and coils are less than 20,000 miles old, we recommend replacing them. To create more horsepower, the car needs to pump more gas into the engine to create the additional combustion. Old spark plugs get worn down and become less effective, resulting in extra gas being left in the combustion chamber which can then pre-detonate and cause misfires.

If you are simply running a JB4 tune and other bolt-on mods then we suggest replacing the spark plugs with OEM plugs. If you are planning on upgrading your turbos, then we recommend using the 1-step colder option. Always stick to the OEM ignition coils.

500HP B58 Mod List

At this point, there is a pretty established 500 horsepower formula for the BMW B58 engine. As we said earlier, to breach the 500 horsepower barrier, you won’t need upgraded turbos, extensive internal work, or a massive fortune to spend on it all.

All of the modifications on this list haven’t changed much since the N54 and N55, as most turbocharged BMW engines benefit the most from a few tried and true upgrades. The following bolt-on mods will get you close to, if not over, the 500 horsepower/450 wheel horsepower mark on the BMW B58 engine.

If you would rather consume this content via a video, check out our How to Build a 500WHP B58 video below:

1. BMS B58 Performance Air Intake

BMS B58 IntakePin

An upgraded intake allows your car to bring more air into the engine which creates more horsepower, faster turbo spool, and an awesome sound. The extra airflow is crucial for creating more pressure inside the engine and also maximizing horsepower gains from additional mods. We consider this a necessity if you are going to use a tuner such as the JB4 or bootmod3 on your B58. The sound made by the intake makes it worth it by itself.

There are a handful of manufacturers out there and all intake systems are more or less the same. We recommend BMS because they have a fantastic reputation in the BMW community and are affordable and quality.

Read our full-guide on intakes here: BMW B58 Upgraded Performance Intake Guide

Price: $199 + Shipping

Horsepower/Torque Gains: 10-20whp / 15-20tq

2. B58 Tune

A quality tune for the BMW B58 is undoubtedly the most cost-effective way to squeeze some additional power from the 3.0L inline-6. The B58’s tuning history is interesting, as tuning companies didn’t find a DME unlock solution until two years after the engine’s debut. Before that time, B58 piggyback tuners ruled the space. However, after the DME was able to be unlocked, flash tunes began to take the top spot.

Both piggyback and flash tunes have their pros and cons. Piggyback tunes do not alter factory DME parameters but instead tricks the DME into running more aggressive ignition timing, increasing boost and other power-increasing parameters. They also allow for on-the-fly map changes, they are easy to install and use, and are less likely to be detected by dealers and service centers if reset to stock. However, piggyback tunes don’t allow for the precise parameter changes possible with a flash tune.

B58 flash tunes, on the other hand, do make adjustments to DME parameters. Flash tunes are generated on computers and the software is then loaded to the cars computer, the DME, generally through the OBDII port. Modern flash tunes, like those by MHD and BM3, are easy to install over a wireless device. Ultimately, they allow for more precise tuning and are not limited to factory DME presets.

If you are interested in learning more, take a look at our Flash Tunes vs Piggyback Tunes guide, but for now we’ll cover our favorite options for each.

BMS JB4 Piggyback Tuner

BMW B58 JB4 Flash TunerPin

Burger Motorsports JB4 tuner is the most popular tuner used on both the N54 and N55 platforms, which is why we recommend it for the B58 platform. This is a piggyback tuner, verses a flash tuner. That means that the JB4 doesn’t actually alter any DME parameters but instead alters signals and sensors to accomplish the tune’s goal. That is in contrast to a B58 flash tune which requires the ECU to be overwritten and it wasn’t until late 2018 that tuning companies were able to crack into the DME and ECU.

While most B58 enthusiasts have moved more towards flash tunes in the recent years, piggyback tunes still have their benefits. Since piggyback tuners, like the JB4, don’t alter the actual DME parameters, the tune can be removed with no trace if you are under factory warranty and need to take your BMW to a certified repair center. We don’t reccomend tuning your B58 BMW under factory warranty as there are other ways that a dealer can detect a tune, but a B58 piggyback tune will give you the best chance of flying under the radar.

The performance gains from a B58 JB4 tune are hard to argue with. With no additional modficaitons, the JB4 is capable of unlocking up to 80 whp on the B58. For a little over $500, it’s hard to argue with that.

Price: $529

Horsepower/Torque Gains: 60-80whp / 40-60tq

BM3 Bootmod3 B58 Flash Tune

Over the past few years, the bootmod3 B58 flash tune has become the most popular option on the market by a significant margin. A lot of that boils down to the fact that BM3 has an extremely easy to use interface, fantastic customer support, and has the potential to generate the most amount of additional performance.

As we mentioned earlier, the versatility and customizability of a B58 flash tune are unmatched. Compared to a piggyback, the DME will see and register all of the changes made to fueling, timing, boost, VANOS, and other tables, which is seen to be a safer approach than tricking it in some instances. Regardless, the additional customizability means that you’ll have the ability to tune your B58 to the exact perameters that you’re looking for whether it be minor adjustments to fueling tables or limiting torque through a part of the rev range.

As a side note, there are a couple of very solid B58 flash tune options on the market currently, with MHD coming in a close second to BM3 in terms of support and ease of use. Ultimately, they are neary identical in terms of function and how much performance can be extracted using them. It boils down to personal preference. If you want to learn more about either BM3 or MHD flash tuning, we have written dedicated guides about them for the B58.

Read our full guide on BM3 flash tunes here: BMW B58 BM3 Tuning Guide

Read our full guide on MHD flash tunes here: BMW B58 MHD Tuning Guide

Price: $595

Stage 1 91 octane: up to 18% HP / 26% TQ
Stage 1 93 octane: up to 20% HP / 26% TQ
Stage 2 91 octane: up to 24% HP / 32% TQ
Stage 2 93 octane: up to 26% HP / 32% TQ

3. Catless Downpipes – VRSF

VRSF B58 DownpipePin

With an intake and tune, your B58 will be bringing significantly more air into the engine. Which means, now we need to be able to get all of that air out. If the air can’t leave as fast as it comes in, back pressure is created. The factory downpipe has a catalytic converter on it, which for emissions purposes, is very restrictive. By replacing the restrictive OEM downpipes with catless downpipes, we eliminate a significant amount of the back pressure and create more horsepower and boost.

I would note a few things here. First, just replacing your downpipes will not make your car crazy loud. It will make a slightly deeper tone, but its not very noticeable from the front of the car and definitely not noticeable inside of it. Your wife won’t even know you did anything to it! Secondly, we only recommend a full exhaust system if you really care about the sound of the car. A full exhaust system will run you more than this list of mods and will get you probably 5 additional horsepower. Full systems aren’t worth it unless you want the loud noise.

VRSF is the best balance of price and performance. Zach and I run the VRSF downpipes on our N54’s and they are great. For our European readers, we recommend the Masata Catless Downpipe which offers the same performance benefits as the VRSF option which is difficult to find overseas.

Read our full guide on downpipes here: BMW B58 Upgraded Downpipe Guide

We strongly recommend catless, but high-flow catted is still better than stock if you are concerned about emissions testing.

Price: $299

Horsepower Gains: 25-30whp with the JB4 + faster turbo spool

4. Meth Injection

Meth injection is the key to making 500hp at the crank and 450whp. Meth injection, referred to as WMI (water/meth injection), sprays a mixture of water and methanol into the intake air just prior to it entering the combustion chamber. The spray reduces the air temperature and also boosts the octane of the gas entering the combustion chamber. Overall result is more combustion aka more power. On the N54 and N55, a chargepipe with a meth bung would be needed, but the chargepipe on the B58 is a pain to remove, so BMS built and adapter which mounts up to the throttle body.

A big limitation of the B58 is fueling. The only way to get around this limitation is through the addition of meth injection. With the above mods, but no meth, you will probably push approx. 400-415whp on 93 octane pump gas. Meth will get you to the 450whp mark.

Price: Depends but approx. $500

Read our full guide on Water/Methanol Injection here: BMW B58 Water Methanol Guide

We recommend running the BMS kit which you can find all about here: B58 BMS Meth Injection Kit

What about Intercooler (FMIC) Upgrades?

If you were reading through our N54 or N55 mod list, you would find an upgraded intercooler on the list. Intercoolers cool the air prior to it entering the engine, which increases the oxygen content of the air ultimately resulting in more combustion and power. The stock B58 intercooler is definitely good, and better than the N55 and N54 ones, largely due to its air to water cooled design.

The factory intercooler is a part of its own low temp cooling system, seperate from the engine cooling circuit. This allows it to have better efficiency, as the incoming air isn’t effected by warm enigne coolant. The one issue, when it comes to aftermarket intercooler upgrades, is that the air to water intercooler is intergrated into the intake manifold. For that reason, there aren’t any upgraded intercoolers available for the B58 as that would require a new manifold as well.

While there isn’t an explicit upgrade available for the intercooler itself, there are a few upgraded heat exchangers available. Both Burger Motorsports and CSF offer upgraded B58 heat exchangers that have a larger surface area which helps increase the efficeincy of the intercooler itself.

If you want to learn more about intercooler upgrades, take a look at out BMW B58 Intercooler & Heat Exchanger Upgrade Guide.

500 Horsepower BMW B58 FAQ

What are the best modifications for the BMW B58?

If you are shooting for the 500 horsepower/450 wheel horsepower threshold, you’ll need a few bolt-on mdifications including an upgraded intake, a tune, an upgraded high-flow or catless downpipe, and water/methanol injection. If you want to push your engine beyond that, you’ll have to start considering an upgraded turbo and additional fueling modifications.

How much power can a BMW B58 handle?

With stock internals, the BMW B58 can handle somewhere in the ballpark of 600-650whp and 550-600wtq. That isn’t really a concern with the modificaitons that we’ve listed here.

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39 Comments

  1. Guys, I LOVE the content, but I’d love to see an update that breaks out the differences between the B58 TU0 and the TU1 and whether this ups the max WHP limits without resorting to meth or other external fueling.

    From what I can gather there’s lots of updates from TU0 to TU1 including the cylinder head with a revised exhaust housing, move to a 1 piece chain drive, a small amount of weight savings, dual cooling circuits between the cylinder walls (hotter temps now) and heads cooling -existing programming and temps and most importantly a move to a max 350 BAR high pressure fuel system including new beefed up direct port fuel injectors. (My understanding is that it only runs 350 bar at WOT and at high RPM). The TU1 also includes the particulate filters.)

    I believe that the added fuel pressure, which BMW says was added to meet WLTP European emissions standards also provides more total fuel flow increasing the max WHP without having to resort to meth or port injection… no?

    It also sounds like the cylinder wall thickness may have been made thinner with TU1 and the crank had some lightening done to it and I’m curious whether this may potentially drop the max safe boost levels vs the TU0 or whether these components are so overbuilt already that that shouldn’t be a concern…

    1. Hi Ryan,

      Thank you for your comment. The same modifications can be done to the 340i xDrive just as with a RWD 340i. The main difference is that the 340i xDrive will make slightly less power to the wheels as compared to rear wheel drive.

      Mod away and enjoy!

      Best Regards,

      BMW Tuning Team

    1. Olá, eu sou do Brasil,
      Queria saber se, no BMW X3M40I no STAGE 2 B58 fica mais rápido doque o S58 X3Mcompetition?
      Outra pergunta, qual é o peso real desse carro X3M40I ?
      Obrigado! 🇧🇷

  2. How do the upgrades on this list pair with MPPSK package? I bought a 2016 340 with MPPSK package but not sure which upgrades are relevant to do or play well.

    Cheers!

    1. Hi Matt,

      All of these mods will work with the MPPK/MPPSK. The main difference is the exhaust on the MPPSK B58 so you may net a few extra horsepower when all is said and done. We don’t recommend upgraded exhausts just since they’re pricey for the performance gains. But in the case of the MPPSK B58 you’ve already got the exhaust (albeit not as beneficial as a fully catless exhaust). Otherwise, expect the mods to have similar benefits although power gains from the tune will be slightly less.

      To avoid confusion, overall power on a non-MPPSK and MPPSK car will end up about the same with mods. However, power gains will be slightly less on the MPPSK since it’s got a higher starting point in terms of horsepower. As an example, the MPPSK has 355hp while a non-MPPSK B58 has 335hp. Let’s say both end at 400hp with a tune only. They both end at the same power, but the MPPSK picks up less power gain from the tune. Maybe in reality the B58 MPPSK ends at 403hp due to its better exhaust.

      Best Regards,

      BMW Tuning

  3. Title: How to Build a 500HP 40i B58 BMW for Less Than $1,500
    Ending: Right now the only way to make 500whp is with an upgraded stage 2 turbo system.

    Way to deliver.

    1. Hey Bill,

      There is a difference between 500hp and 500whp. A 500 horsepower B58 would make about 440whp assuming a pretty standard 12% drive-train loss. Long story short, a stock turbo B58 can make 500hp. However, it’s likely not going to make 500 wheel horsepower.

      Though, we should probably update that as I believe a few stock turbo B58’s have neared or just eclipsed the 500whp mark. Nonetheless, that is surely maxing out the stock turbo and we would still recommend an upgraded turbo for a legit 500whp.

      Regards,

      BMW Tuning

  4. Hey BMW Tuning,

    I was looking at getting a 2016-18 340i xdrive in a 6SPD but have found conflicting information online and was hoping you guys could help me.

    1.) Are these cars torque limited in gears 1-3? I am looking to do full bolt-ons and a decent tune with the car and I don’t wanna waste my time and money if its going to be cut out by the transmission itself.

    2.) Even though I really want a MT would I be better off with the AT if I’m looking to add the extra HP? I was hoping to be somewhere around 400whp.

    Any information would be great, and like I said I really do want the manual but I don’t wanna be totally let down either.

    Thanks,

    Tyler

    1. Hi Tyler,

      First off, good luck with the 340i search.

      1) The B58 is not torque limited in 1st through 3rd gear. Not to make things too confusing but there is a maximum torque value the transmission can see (torque limit). This doesn’t mean actual torque is limited. Tunes will essentially ensure torque is never cut by not allowing the ECU/TCU to see higher than the torque limit. So the B58 may actually be making more torque than the “limit”, but it doesn’t know that. There are additional solutions to raise these limits, such as XHP.
      I believe this is a far superior explanation than mine: https://www.facebook.com/xhpflashtool/posts/line-pressure-vs-engine-torqueand-what-this-has-to-do-with-the-durability-of-you/2103607396621945/

      2) In the long run, the manual transmission will likely hold up better with the additional power. An upgraded clutch may be required, though. The AT is still a stout transmission and should be more than fine under 500whp and 500wtq.

      Best Regards,

      BMW Tuning

      1. Really appreciate the expedited answer!

        I will definitely be looking for a 6 speed manual now that I know. You have really helped me out here,

        Cheers!

        Ty

    1. Hi Serj,

      These mods can be done to the 740i as it uses the same B58 engine. We believe the linked parts should fit, but just confirm the fitment of individual parts.

      Best Regards,
      BMWTuning

  5. Hi, I have 2018 440iGP. I installed the MPPSK, Dinan Elite II and Dinan air intake. Would having the exhaust modified to accept the catless VRSF downpipe benefit WHP or would it confuse the programming of the MPPSK? If done, would lessen wear on the turbocharger (is there a need to be concerned having added the Dinan intake? Without have the dino test performed, any idea of where torque or HP sits? Thanks

  6. Hi I was wondering for the bms intake since it uses the factory piping is there anything that I can find that would upgrade the piping from factory to something more durable? Like how you can change the charge pipe from the regular plastic to aluminum. If I got the bms intake I would want to look into getting better piping as well.

  7. Hey,
    This is a great post.
    I am a happy owner of a built 2018 manual. I don’t have all the bells an whistles like some, but all I wanted was a manual who I can keep for year to come.
    I’m a big fan of Terry’s products at BMS as I used them for an older N55 I had.

    In your guys opinions, is this a decent setup for my manual 40i? It’s my everyday driver but I love getting on it when I’m in the car.

    Thanks for any feedback.

    1. Hi TJ,

      Awesome car equipped with the 6MT. I think the mods in this post would be a great compliment. A tune + intake is always a great starting point, in our opinion. The B58 can make some impressive power with a tune only and the power up-top is very flat. I’d say start with a tune or tune + intake and give it a few months. If you’re still wanting more power then a downpipe, meth injection, and/or small E85 mixes are a great next step. Let us know if you have any additional questions.

      Best Regards,
      Zach

  8. Quick question. With a catless down pipe. Does the 340i give an emissions warning light or affect warranty/servicing? As I’m thinking of just the air pod and down pipe for now and love noise and bang for bucks.

  9. Hey guys, thanks for having this forum setup, tons of information. In like TJ and own a 18’ 440i xDrive 6MT. I was talking to my mechanic and state emissions would not be an issue for doing a careless downpipe. His only question was, would having this type of Dow pipe trigger a check engine light or anything noticeable that would require the error code to be addressed? Has anyone installed a catless Downpipe without any issues?

    Excited to do tune my car, was hoping the JB4 would remove the insanely low speed limiter…. leaning towards DINAN because of that reason but love what JB4 does…. decisions decisions.

    Still miss my e36 NA engine every single day, those were the days when a car gave you feedback… new ones are numb, but super thankful for the 440i 6MT and this forum to squeeze more power out of the B58

  10. Does it matter if i get a jb4 tune i was looking into the MHD tuning kit but i dont wanna deviate from this mod list unless tunes are compatible with whatever parts.

    1. Hi Danny,

      You can go with either JB4, MHD, or bootmod3. Some of it just comes down to personal preference. Many prefer the standalone flash tuning options, but the JB4 has a lot to offer especially if you want to stack the JB4 with a back-end flash tune.

      Best Regards,
      Zach

  11. I am going to share my experience with modding the B58.

    I have the BMS CAI, and it is nice and very well designed. Great product for the price. However, I think the stock Airbox is actually better, and you are better off just getting the BMS Silicon Intake Elbow for $69 and then your choice of a better drop-in filter for the stock Airbox.

    The VRSF Downpipe recommendation is spot on. Definitely get this. Easy to install on RWD models. I hear it’s trickier on AWD. On my RWD I was able to install it without using a Jack or lift. You do have to unbolt the exhaust hangers on the muffler to get it to slide on/off where it meets the midpipe.

    There are many options for tuning, of which the BMS JB4 is decent. The JB4 really only sees full potential when used with Backend flashes from an MHD flasher, and at that point it’s probably better to just skip the JB4 and go all in with the MHD Tune.

    Meth injection is alright but not completely necessary. If you want it definitely get the JB4 so you can use it as a controller and for the failsafes.

    Here would be my build suggestions:

    B58TU0 (475-525 rwhp)
    1. VRSF Catless Downpipe
    2. MHD Flasher and Super License (Stage 2+ E30)
    3. xHP Stage 3 Transmission license (Flashed Through MHD Dongle) (only if Automatic)
    4. Dorch Stage 1 HPFP
    5. BMS Silicone Intake Elbow

    B58TU1 (475-525 rwhp)
    1. VRSF Catless Downpipe
    2. MHD Flasher and Super License (Stage 2+ E30)
    3. xHP Stage 3 Transmission license (Flashed Through MHD Dongle) (only if Automatic)
    4. BMS Silicone Intake Elbow

  12. I have a 2017 440i Xdrive convertible and would love to make these modifications to my ride. I’m mechanically challenged. Could you recommend an installer in Rhode Island?

    Phil

    1. Hi Phil,

      We’re not familiar with the Rhode Island area, so we can’t give any direction on that. However, installing a tune and intake are incredibly easy. The JB4 takes a little messing around, but it’s all straight-forward and easy. Otherwise, you can opt for Bootmod3 (BM3) which is also an excellent tune and it’s very easy to flash. Just charge the battery during the install to be extra safe. An intake install can take a little patience for those who are mechanically challenged, but it’s very do-able.

      Downpipes and intercooler/heat exchangers are where it gets a bit more complicated. However, we highly recommend starting with a tune alone or tune + intake. Downpipes are an incredible mod, but be cautious doing too much at once. You get used to the power and always want more. Spacing out the mods a little bit helps you buy some extra time.

      If you’re really not comfortable installing the tune or intake then it shouldn’t be hard to find a shop. I’d have faith in any trustworthy shop to get the job done, even if they don’t specialize in BMW. Look for a quality shop with fair rates. A tune and intake should be no more than 1 to 1.5 hours of labor. Downpipes and intercoolers will be at least a couple hours, but again I’d recommend saving those mods for a little down the road.

      Best Regards,
      Zach

  13. I am mechanically challenged but love the power. I have a 2020 340I x Drive and want to know if the install of the Pure 800 as advocated by Kies on you tube is a stand alone mod? What Whp will it deliver? Yhanks!

  14. Great article guys!

    Lots of good info here for a new 340i owner.

    A small thing that stood out to me was the comment that, “Back pressure is actually good for naturally aspirated cars”.

    Back pressure is good for no cars. It is in fact scavenging that is good for NA cars (and to a lesser degree for supercharged cars).

    If you get the exhaust gas velocities correct, the pressure wave will help to remove more combustion gases from the cylinders for a desired RPM range. This results in an increased available volume within the combustion chamber at the start of the intake cycle. Less burnt fuel and more fresh fuel = more torque/power.

    Gas velocities are a function of pipe diameter which is why exhaust header design is crucial for NA engines. Too large a diameter results in slower gas velocities and shifts the ideal RPM range (for scavenging) beyond the physical capabilities of the engine.

    Exhaust back pressure is a function of gas velocity and pipe diameter. Keeping the exhaust diameter relatively small helps to maintain higher gas velocities but as a result the back pressure is higher. Hence the confusion why people think back pressure s actually good for naturally aspirated cars.

    1. Hi Ammar,

      These mods absolutely work on the M340i xDrive. Just double check fitment on specific parts. For example, the downpipes are different and can be found from VRSF here.

      550 horsepower at the crank is likely obtainable, but that’s just about the max on the stock turbo assuming a 12-15% drivetrain loss. You can end up around 470-500whp with an aggressive tune and all of the proper supporting mods (tune, downpipe, intake, methanol injection, and ideally a small E85 mix). You may consider some cooling mods, too. If you want a very consistent and easily obtainable 550hp then you may want to consider a turbo upgrade.

      The M340i is an awesome car. Enjoy the modding and additional power. A few simple bolt-ons certainly turn the B58 into a whole different animal.

      Best Regards,
      BMW Tuning

  15. Hi! This is fantastic info. …Is it possible or okay to just install the intake and catted down pipe? Thanks for your time and service.

    1. Hi Chris,

      We appreciate the kind words! You can certainly just opt for a catted downpipe and intake. However, the power and torque gains will be pretty minimal without a proper tune. You might still pick up some power, but it’s really the tune that helps other mods gain power.

      Best Regards,
      Zach

  16. Zach– Thanks again for your knowledge and support. …I may just start with BMS intake– I like the sound it makes. Then may add the downpipe and possibly a tune later. 440 seems fast enough stock lol 🙂

  17. Thanks for the info Zach, I see some changes on my 2018 440i immediately! Any thoughts on the down pipe and the dreaded factories after market extended warranty? I can’t get a straight answer out of my BMW dealer. Thanks again

  18. Hey! Super solid info, so happy I found your site and I’ve put these guides to use. Currently have a 2017 MPPSK 440i xDrive manual. Previously had a RWD 18′ but got totaled earlier this year. Anyways, I was wondering about the downpipe in this particular vehicle, and if it was worth swapping out for a catless? Had a catless fapo moto installed on the 18′, but given the exhaust system on my vehicle already I wasn’t sure if it made sense to swap it out.

    My current mod list consists of: TU HPFP, OTS bm3 stage 2+ tune, injen intake, upgraded coil pack brakes and rotors, vtt crank caase breather, weichers strut brace and looking to do a turbo next. Beyond that Id definitely want to pull more power out of it. Thoughts?

  19. Hi guys, thanks for the great article. I finally bought a 2018 340i xdrive with less than 11k km on it (6-7k miles). The car is literally brand new. My questions is this – would it be too early to tune the car with stage 1 MHD or JB4 on a completely stock car considering that it only has less than 11k km on it? Even if we ignore the low km, has anyone ever complained about any earlier than usual wear and tear of the turbo, engine, etc.? I know that the engine could carry way more power than it originally has but does that come at any price in the long term? Also in the near future I’m planning going with the VRSF catless DP and although a lot of people say it is completely safe for the engine and the turbo, I wonder is it really safe in the long term? Thank you very much!

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