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 achieve a more aggressive tone. All products are manufactured from 304L aircraft grade stainless steel, ensuring durability in harsh conditions. The performance exhaust systems 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 customization - Manufactured from 304L aircraft grade stainless steel - Distributed to more than 90 countries worldwide Specifications: - Pipe Diameter: 57.15 - Race Product: No - EMarked: No Kit comes with: - Front Link Pipe Assembly - MSAU176 - RH Centre Section Non-Resonated - MSAU177REP - LH Centre Section Non-Resonated - MSAU178REP - Polished Jet (round) 100 Exhaust Tip - MSAU246 - Polished Jet (round) 100 Exhaust Tip - MSAU247 - LH Rear Silencer - MSAU270 - RH Rear Silencer - MSAU271 - Brace Bar - MSAU314 Vehicle Compatibility: - 2003-2005 Audi S4 4.2 V8 quattro B6 Saloon/Sedan, Avant, Cabriolet