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 manufactured in the UK and distributed to over 90 countries worldwide. Note: Requires Stage 2 ECU Remap. - Larger diameter than OEM for increased exhaust flow - Designed to enhance both performance and sound - Manufactured in the UK and distributed globally Specifications: - Pipe Diameter: 76.20 - Race Product: Yes - EMarked: No Kit comes with: - MSBM267: RH Primary Cat Rep Downpipe - MSBM267 - MSBM266: LH Primary Cat Rep Downpipe - MSBM266 - MSBM268: High Flow 200cpsi Twin Cat Assembly (under floor) - MSBM268 Vehicle Compatibility: - 2014-2018 BMW 3 Series F80 M3 & M3 Competition Saloon (Non OPF/GPF Models Only) - 2014-2018 BMW 4 Series F82/83 M4 Coupe/Convertible & M4 Competition Coupe (Non-OPF equipped models only)