4.0 TFSI 3-Inch Cat-Back Downpipe Set

The Redstar Exhaust downpipes are meticulously crafted for Audi S6, RS6, S7, RS7, A8, and S8 models equipped with the 4.0 TFSI engine, specifically for the C7/C7.5 (S6/RS6, S7/RS7) and D4/D4.5 (A8/S8) chassis from 2012 onwards. They are designed as a 100% bolt-on installation, directly fitting OEM mid-pipes, and include all necessary brackets and mounts. The precision CNC machined flanges ensure a perfect fit, while the 5-year warranty provides peace of mind. These performance downpipes offer significant power gains, faster turbo spool-up, and improved throttle response. They also contribute to increasing the lifespan of the turbos, reducing under-hood temperatures, and adding a desirable tone to the exhaust note. Optional HJS HD 200cpsi or GESI GEN2 400cpsi catalytic converters are available, rated for 500-850hp each. OEM-style heat shielding with a ceramic inner liner can also be added to reduce radiant heat. Important considerations: Removing factory catalytic converters will trigger a check engine light, which can be mitigated with optional O2 sensor restrictors. A firmware update is recommended for maximum performance gains. They are not certified and may not be legal in all jurisdictions. Use in California, USA, is prohibited as they are not C.A.R.B. compliant.