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 and are produced in the UK. - Direct replacement for the original exhaust system - Multiple configurations for sound and tone adjustment - Manufactured from 304L aircraft grade stainless steel - Designed for a broad range of vehicle applications Specifications: - Pipe Diameter: 57.15 - Race Product: No Kit comes with: - Front Link Pipe Assembly - MSAU176 - RH Centre Section - MSAU177 - LH Centre Section - MSAU178 - LH Rear Silencer - MSAU270 - RH Rear Silencer - MSAU271 - Brace Bar - MSAU314 - Polished GT (round) 100 Exhaust Tip, RH - MSAU485 - Polished GT (round) 100 Exhaust Tip, LH - MSAU486 Vehicle Compatibility: - 2001-2005 Audi A4 3.0 V6 B6 quattro Saloon, Avant & Cabriolet - 2003-2005 Audi S4 4.2 V8 quattro B6 Saloon/Sedan, Avant & Cabriolet