AIRTEC Motorsport 3.5" Secondary Cat Bypass for BMW G80 M3 and G82 M4

Measuring 3.5" in diameter, this direct replacement mid-pipe for the secondary cats and GPF offers improved flow over standard and comes complete with a replacement exhaust brace and fitting kit, which will mate to original catalytic converters, aftermarket sports cats or aftermarket de-cats.

By replacing the restrictive secondary catalytic converters located in the mid-pipe section directly after the downpipes, back pressure is reduced, improving engine breathing for faster throttle response, increased power output and a more aggressive exhaust note. Made from high quality stainless steel with smooth bends to ensure increased flow. Fits BMW G80 M3 and G82 M4 (left and right-hand drive).

Note: Sold for motorsport and off-road use only. ECU recalibration required to prevent EML illumination.