If raw and rowdy are your speed, the Track Edition Cat Back is your dose of steel. The Track Edition Exhaust retains all the engineering and precision of the SwitchPath* Exhaust, including the X-pipe and 3* diameter tubing, minus the valves in the rear sections. The result? Constant rumble. Warning! These versions are known to get rowdy, and may be too much for many. For that reason, this particular version cannot be returned due to sound preference. Prepare yourself. The included Performance Mid Pipes replace the factory mid section with a 3* stainless steel X-pipe, mating to the factory Axle Back.AWE's signature 4" double walled slash-cut tips finish it off -- all individually adjustable, allowing depth into the bumper to be set according to personal taste. Available in Diamond Black or Chrome Silver. AWE Track Edition Catback Exhaust for BMW F90 M5 - Chrome Silver Tips