The Cat-Back systems are designed as direct replacements for the original exhaust, offering improved sound and aesthetics. Multiple configurations are available, allowing the owner to select the desired increase in exhaust volume or a more aggressive tone. All products are manufactured from 304L 'Aircraft' Grade stainless steel, ensuring durability in harsh conditions. The performance exhaust systems are developed for a wide range of vehicles, with ongoing research and development to meet performance exhaust requirements. - Direct replacement for the original exhaust system - Available in multiple configurations for sound and tone customization - Manufactured from 304L 'Aircraft' Grade stainless steel - Designed and made in the UK Specifications: - Pipe Diameter: 70.00 - Race Product: No - EMarked: Yes - EMark Number: BMWM3M4 Kit comes with: - F5111: Adapter Pipe 70 O.D. to 65 I.D. 130 long - MSAU529: Polished GT (round) 90 Exhaust Tip, Standard - MSAU529 - MSBM255: Centre Silencer (EC-Approved) - MSBM255 - MSBM256: Rear Silencer - MSBM256 - MSBM269: Rear Silencer Connecting Pipe Left Hand - MSBM269 - MSBM270: Rear Silencer Connecting Pipe Right Hand - MSBM270 Vehicle Compatibility: - 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) 2014-2018