AWE Tuning Audi B9 S4 SwitchPath Exhaust - Non-Resonated (Silver 102mm Tips)From the masters of S4 performance, AWE proudly presents the B9 S4 exhaust solution. Signature AWE tone, performance, and options for every taste and budget. The SwitchPath valved solution is for those who want complete control of their S4s volume and tone, at their fingertips. The AWE SwitchPath Exhaust comes complete with non resonated downpipes, a precision engineered x pipe mid section, and two valved muffler sections which can be controlled via