The Milltek Sport Turbo-Back range provides performance enhancements for turbocharged vehicle owners seeking to tune their vehicles. The system features an enlarged diameter throughout, improving gas-flow properties and reducing back pressure due to decreased restrictions, while delivering an aggressive exhaust sound. The Milltek Hi-Flow Sports Catalyst reduces restriction compared to OE catalysts, allowing for a free-flowing exhaust system that can improve engine performance. This system requires a Stage 2 ECU remap. Fitting Notes: Propshaft requires removing and the engine subframe lowering to allow O.E part removal. - Enlarged diameter exhaust system for improved gas flow - Hi-Flow Sports Catalyst reduces restriction over OE catalysts - Delivers an aggressive exhaust sound - Requires Stage 2 ECU remap Specifications: - Pipe Diameter: 76.20 mm - Installation Time: 4 to 5 hours (including removing OE system) - Race Product: Yes - EMarked: No Kit comes with: - 100mm Hi-Flow Turbo Elbow - MSAU497 - Hi-Flow Sports Catalyst Assembly - MSAU498 - Connecting Pipe - MSAU499 - Rear Silencer - MSAU500 Vehicle Compatibility: - Audi TT Mk2 TT RS Coupe 2.5-litre TFSI quattro 2009-2014 - Audi TT Mk2 TT RS Roadster 2.5-litre TFSI quattro 2009-2014