B58 Heat Exchanger Upgrade Guide
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BMW B58 Intercooler & Heat Exchanger Upgrade Guide

Yes, the B58 engine does have an intercooler. However, it is not the common intercooler setup you would see on most turbo vehicles. While most forced induction engines use “direct” air-to-air cooling, the B58 intercooler uses an “indirect” water-to-air cooling system. The B58 intercooler is integrated into the intake manifold. Compressed air flows through the…

N55 Downpipe Upgrade Guide
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BMW N55 Downpipes Guide: Catless vs. High-Flow

The exhaust downpipe is the first part of the exhaust system on the N55 engine. It bolts-up straight to the turbocharger and passes air from the turbo to the cat-back portion of the full exhaust system. The OEM downpipes have catalytic converters on them, for emissions purposes. However, the catalytic converters are extremely restrictive and…

B58 Stock Turbo Max Boost

BMW B58 Stock Turbo Max Boost

While the phrase that something is “an art, not science” is used frequently, it does not hold true with turbo boost and tuning. Turbochargers, engine internals, and ancillarily engine support systems can only hold so much boost before they give in. We’re here to answer some frequently asked questions on B58 boost levels: How much…

Is MPPSK Worth It

BMW MPPSK Package: Performance Benefits & Is it Worth the Cost?

What is the BMW MPPSK Package? The BMW MPPSK package stands for the “M-Performance Power and Sound Kit”. The kit is BMW-designed and manufactured and includes a more aggressive engine tune and a performance exhaust system to increase the performance, horsepower, and sound. The kit is only available for 40i models, featuring the B58 engine….

BMW S55 vs S58
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BMW S55 vs S58: Performance, Reliability & Tuning

BMW forever left the world of naturally-aspirated performance motors in M-series cars in 2013 with the launch of the S55. Succeeding the NA V8 S65 motor, the S55 was a 3.0L twin-turbocharged inline-6. Despite being the performance version of the N55, the S55 has little in common: a closed deck block, twin turbos, forged pistons,…

N55 Wastegate EWG PWG

BMW N55 EWG vs PWG

What is the difference between PWG and EWG N55 engines? This question comes up often and is a big talking point regarding the N55’s performance. EWG and PWG refer to the turbocharger wastegates. Though it sounds like a minor difference, the wastegates play an important role in tuning and power. Let’s jump in and examine…

BMW N55 FAQ

BMW N55 FAQ

If you want to search for a specific topic use the following keys: Windows: Ctrl + F Mac: Command + F We’ll break this down into the following sections: If you are looking for a long-form article that goes into detail about N55 specs, modifications, common engine problems, and reliability, check out our Ultimate BMW…