Akrapovic Evolution Link Pipe set (Titanium) Short for G8X M2 / M3 / M4OP Optional partConstructed from high grade titanium, this lighter than stock link pipe is available for the United States only, the link pipe is shorter, allowing the stock catalytic converters to remain on the car. Combined with a Slip On Line (Titanium) and delivering a deep, rich, and sporty sound without drone, it totally embraces the pure turbocharged inline six cylinder sound. Remapping is mandatory. This product is meant for racetrack use and