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 exhaust volume and tone. All products are manufactured from 304L 'Aircraft' Grade stainless steel for durability in harsh conditions. Performance exhaust systems are available for a wide range of vehicles. 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 volume and tone adjustment - Manufactured from 304L 'Aircraft' Grade stainless steel - Made in the UK and distributed globally Specifications: - Pipe Diameter: 60.30 - Installation Time: 2 to 3 hours (including removal of OE system) - Race Product: No - EMarked: No Kit comes with: - LH Downpipe - MSAU461 - RH Downpipe - MSAU462 - Front Silencer - MSAU463 - Centre Silencer - MSAU464 - LH Rear Silencer Delete Pipe - MSAU467 - RH Rear Silencer Bypass Pipe - MSAU468 - Polished GT (round) 80 Exhaust Tip, LH Twin Tip - MSAU505 - Polished GT (round) 80 Exhaust Tip, RH Twin Tip - MSAU506 - Brace Bar - MSAU513 Vehicle Compatibility: - Audi S4 3.0 Supercharged V6 B8 2009-2012