This decat downpipe for S55 engines will provide your car with derestricted flow of exhaust gases which will result in higher performance and louder noise.
Decat downpipe is essential for higher levels of power gains.
Please note: due to current EU legislation on car emissions cars equipped with no catalytic converter should only be used on track. They will also not pass an MOT.
This products fits all the S55 engines found in F80 M3, F82 M4 and F83 M4 Convertible.