Here is an M5 with a Corsa Performance T-304 stainless exhaust system for 2006, 2007, 2008 and 2009 E60 M5. Features mandrel-bent tubing, polished quad 3.5" tips, and drone-free quiet-cruising, thanks to Corsa's patented Reflective Sound-Cancellation (RSC) technology. This technology is a non-electrical noise control system without the complication of incorporating the use of electronics or speakers. Essentially, engine sound (pressure) waves are reflected in passages inside the muffler 180 degrees out of phase to cancel out unwanted sound waves. The result is a "tuned" muffler that "cleans up" the noise without eliminating the pure sound of power associated with a high-performance vehicle.