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 current demands. All products are made in the UK and distributed to over 90 countries worldwide. - Direct replacement for the original exhaust system - Available in multiple configurations for sound and tone adjustment - Manufactured from 304L aircraft grade stainless steel - Designed and made in the UK Specifications: - Pipe Diameter: 66.50 - Fitment Time: 1 to 1.5 hours (including removal of OE system) - Race Product: No - EMarked: No Kit comes with: - 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 - Burnt Titanium GT (round) 90 Exhaust Tip, Standard - MSTIP217 Vehicle Compatibility: - 2015-2018 BMW 1 Series M140i 3 & 5 Door (F20 & F21 LCI, Non-OPF)