[Info@mad-us.com]

Throw a single midpipe on there it wont throw any check engine lights. Other than that maybe an intake.

Intake https://mad-us.com/mad-bmw-s55-m3-m4...ow-air-intake/

Midpipe https://mad-us.com/mad-bmw-f8x-m3-m4...race-included/