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. Each system is manufactured from 304L aircraft grade stainless steel, ensuring durability in harsh conditions. All products are made in the UK and distributed to over 90 countries. - Direct replacement for the original exhaust system - Multiple configurations for volume and tone adjustment - Constructed from 304L aircraft grade stainless steel - Manufactured in the UK and distributed worldwide Specifications: - Pipe Diameter: 70.00 - Race Product: No - EMarked: No Kit comes with: - F5111: Adapter Pipe 70 O.D. to 65 I.D. 130 long - MSBM256: Rear Silencer - MSBM256 - MSBM323: LH Centre Connection Pipe (Equal Length Version) - MSBM323 - MSBM324: RH Centre Connection Pipe (Equal Length Version) - MSBM324 - MSTIP217: Burnt Titanium GT (round) 90 Exhaust Tip, Standard - MSTIP217 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)