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(Optional) Custom tuning available through tuners in the bootmod3 Tuner Directory
these filters integrate seamlessly into the factory airbox while delivering exceptional airflow for improved engine performance and responsiveness
a common issue on many other S55 J Pipes
and exhaust note on your S55 powered M4
2015-2019 BMW M3 & M4
MAD BMW S55 Downpipes M2C M3 M4 W/ Flex Section supra wing (Optional) Custom tuning available throughUpgrade from the stock S55 downpipes to the MAD S55 catless downpipes for maximum airflow, power, and sound! Upgrade to the MAD BMW S55 downpipes to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. As a bonus, your car will sound a lot nicer as well. Expect up to a 30HP increase on a tuned BMW S55 with stock turbos, even more on cars with
