Milltek Sport Large-Bore Downpipes are designed to improve both performance and sound. These downpipes feature a larger diameter compared to standard OEM parts, allowing more exhaust gas to exit the engine and pass through, which increases efficiency. When used with the Catalyst Bypass Pipe, significant power gains can be achieved without restriction on gas flow from a catalyst. Note: Possible clearance issues on roadster due to additional bracing. Warning: This product is intended for motorsport use only and requires Stage 2 ECU Remap. - Larger diameter than OEM for improved gas flow - Designed to increase efficiency and performance - Compatible with Catalyst Bypass Pipe for maximum power gain Specifications: - Pipe Diameter: 76.20 - Race Product: Yes - EMarked: No Kit comes with: - Large-bore Downpipe Assembly - MSAU607 - Catalyst Bypass Pipe - MSAU608REP Vehicle Compatibility: - Audi TT 180 / 225 quattro Coupe & Roadster 1998-2006