AWE Tuning Audi B9 S4 SwitchPath Exhaust - Non-Resonated (Black 102mm Tips)Instead, the Track Edition comes with non resonated downpipes and straight pipe sections. The precision engineered x pipe and Sportback specific mid merge are the only filters. This version is known to get rowdy and may be too much for many. For that reason, this version cannot be returned due to sound preference. Prepare yourself. SwitchPath Exhaust The SwitchPath valved solution is for those who want complete control of their S5 Sportbacks volume