The item listed is a high quality, 3.25 Inch premium valvetronic exhaust system made specifically to fit and complement the BMW M5 F10 5 Series. The system is a cat-back exhaust, meaning it bolts onto the catalytic converters and thus replaces everything from that point on the vehicle; the centre section piping, the rear section and the tailpipes. The exhaust system is fully mandrel bent and TIG welded in order to provide optimal gas flows and increase the performance of the vehicle. The exhaust comes with a lifetime guarantee.