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. All Milltek Sport performance exhaust systems are made in the UK and distributed to over 90 countries worldwide. Note: For fitment with OE Cat-Back System only. Note: Requires a Stage 2 ECU remap. - Larger diameter than OEM for improved gas flow - Designed to enhance both performance and sound - Made in the UK and distributed globally Specifications: - Pipe Diameter: 76.20 - Race Product: Yes - EMarked: No Kit comes with: - MSVAG05: Cast Large Bore Downpipe 200cell HJS Catalyst - MSVAG05 - MSAU673: Connecting Pipe - MSAU673 Vehicle Compatibility: - 2015-2018 Audi TT Mk3 TTS 2.0TFSI Quattro (Non-OPF/GPF Models)