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. Constructed from 304L aircraft grade stainless steel, these systems are built to withstand harsh conditions. All products are manufactured in the UK and distributed globally. - Direct replacement for the original exhaust system - Available in multiple configurations for sound customization - Made from 304L aircraft grade stainless steel - Manufactured in the UK and distributed worldwide Specifications: - Pipe Diameter: 66.50 - Fitment Time: 1 to 1.5 hours (including removing OE system) - Race Product: No - EMarked: No Kit comes with: - Polished GT (round) 90 Exhaust Tip, Standard - MSAU529 - Rear Silencer Assembly (Valved) - MSBM246 - Front Connecting Pipe - MSBM275 - Centre Connecting Pipe - MSBM276 - Outlet Pipe (Non-Valved) - MSBM277 - Outlet Pipe (Valved) - MSBM278 - LH Mounting Bracket - MSBM279 - RH Mounting Bracket - MSBM280 Vehicle Compatibility: - 2015-2018 BMW 1 Series M140i 3 & 5 Door (F20 & F21 LCI, Non-OPF)