Untd. Performance 2 Muffler Cat-Back – K04/RS6 For Aud S4 B5 A6/Allroad C5 2.7L Bi Turbo

Performance oriented aftermarket downpipes increase horsepower on a turbocharged vehicle by enabling higher flow of exhaust air than the OEM pipes. Vacating exhaust air more efficiently through optimized and smooth bore flow paths ensures that the exhaust pressure is constantly lower than the intake pressure, allowing the engine to breathe in more air, burn more fuel, and thus generate more power.
This XS-POWER RESONATED V-BAND VERSION II Braided flex downpipe features 3″ tapered to 2.5″ piping to achieve horsepower gains across the entire RPM range on 2.7L Audi S4/RS4 (B5) and A6/Allroad (C5). Catalytic converter is removed to eliminate restrictions on exhaust flow.
The unique hybrid design of the inlet flanges enables direct bolt-on for stock K03 turbo, upgrade K04 turbo and custom built RS6 turbo.

The piping is constructed from premium 16-gauge(1.5mm) austenitic T304 stainless steel for superior durability. It is fully mandrel bent to maintain high flow rate. TIG welded at all joints, it also combines a cracking and corrosion resistant surface and an obstacle free internal wall. The surface is polished to add an extra layer of protection against wearing in various operating environment.