Constructed from high-grade lightweight titanium with two pairs of titanium / carbon-fibre tailpipes and featuring exhaust valves with housings cast in the in-house foundry, the Akrapovič exhaust system for X4 M/ Competition is a stunning design that combines performance with an incredible soundtrack and huge visual appeal. The soundhas been tuned to ideally suit the in-line six-cylinder turbo engine, delivering an increase in the volume sensation, which provides exciting acoustic feedback when shifting through the gears. Any unwanted drone is eliminated. The optional Akrapovič Sound Kit can be added to upgrade the package.