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. Manufactured from 304L aircraft grade stainless steel, these systems are built to withstand harsh conditions. All products are made in the UK and distributed to over 90 countries worldwide. - Direct replacement for the original system - Available in multiple configurations for sound and tone adjustment - Constructed from 304L aircraft grade stainless steel - Made in the UK and distributed globally 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 - 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 - MSTIP225: Carbon Fibre Jet (round) 90 Exhaust Tip, Standard - MSTIP225 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)