The Milltek Sport Turbo-Back range offers performance enhancements for turbocharged vehicle owners seeking to tune their vehicles. The system features an enlarged diameter throughout, enhancing gas-flow properties and reducing back pressure due to decreased restrictions. This results in a suitably 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 product requires a Stage 2 ECU remap. - Enlarged diameter exhaust system for improved gas flow - Hi-Flow Sports Catalyst reduces restriction over OE catalysts - Designed for turbocharged vehicles seeking performance tuning - Produces an aggressive exhaust sound Specifications: - Pipe Diameter: 76.20 - Race Product: Yes - EMarked: No Kit comes with: - MSVAG05: Cast Large Bore Downpipe 200cell HJS Catalyst - MSVAG05 - MSAU617: Front Connecting Pipe - MSAU617 - MSAU618: Centre Silencer - MSAU618 - MSAU619: Rear Silencer - MSAU619 - MSVW372: Cerakote Black GT (round) 100 Exhaust Tip, Standard - MSVW372 Vehicle Compatibility: - 2013-2018 Audi S3 2.0 TFSI quattro 3-Door 8V/8V.2 (Non-GPF Equipped Models Only)