BMW S63 Tuning & Modding Guide The BMW S63tu is a 4.4L twin turbo V8 found in 2012-2017 M5 and M6 models. It produces an astounding 560hp and 500 lb-ft of torque from the factory. Even better, like many BMW engines, the S63 is also underrated. Aftermarket dyno tests show the S63 around 530whp and 520wtq. Nor does it end there. Wake up this beast with a simple tune and … [Read more...] about How to Build a 700HP+ BMW S63tu for Under $1,500