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 combined with the Hi-Flow Sports Cat, a significant increase in performance and a noticeable change in sound can be expected. Stage 2 ECU remap is required. Note: Possible clearance issues on roadster due to additional bracing. - Large diameter downpipes for increased exhaust flow - Designed to enhance performance and sound - Requires Stage 2 ECU remap Specifications: - Pipe Diameter: 76.20 - Race Product: Yes - EMarked: No Kit comes with: - Large-bore Downpipe Assembly - MSAU607 - Hi-Flow Sports Catalyst - MSAU608 Vehicle Compatibility: - Audi TT 180 / 225 quattro Coupe & Roadster 1998-2006