GAS Downpipe Set, B8/B8.5/C7/C7.5 S4/S5/Q5/SQ5/A6/A7 3.0T Supercharged

Stock downpipes are small, restrictive, and prone to flex joint and resonator failure.  Our high-flow downpipes are built completely with T304 stainless steel for high strength, corrosion resistance, and longevity. These downpipes remove the small front resonators (sometimes mistaken for secondary cats), allowing your engine to breathe through larger 2.5" piping and smooth transitions. In addition to improved sound, expect power gains as high as 15HP to the wheels depending on tuning and hardware. Our downpipes have been shown to improve times consistently, dropping 0.17 seconds off 60-130 times, as well as a 0.06 second reduction in 1/4 mile times over stock downpipes with no other changes!     Often imitated, never duplicated. Our 3.0T downpipe design has been so effective that it has been blatantly copied by other companies! Our trial & error and testing over the years has yielded the best possible configuration, leading to replicas made offshore, copy-and-pasting everything fr