Milltek Sport Large-Bore Downpipes are designed for use with the Milltek Sport Cat-Back System only. These downpipes feature a larger diameter than 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. All Milltek Sport performance exhaust systems are developed for a wide range of vehicles and are manufactured in the UK. Note: Requires a Stage 2 ECU remap. - Large-bore design increases exhaust flow over OEM parts - Designed for use with Milltek Sport Cat-Back System - Manufactured in the UK - Hi-Flow Sports Cat provides improved performance and sound Specifications: - Pipe Diameter: 76.20 - Race Product: No - EMarked: No Kit comes with: - Large-bore Downpipe and 200-CPSI Hi-flow Sports Catalyst (EC-Approved) - MSAU623 - Connecting Pipe - MSAU672 Vehicle Compatibility: - 2015-2018 Audi TT Mk3 TTS 2.0TFSI Quattro (Non-OPF/GPF Models)