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. Each system is manufactured from 304L aircraft grade stainless steel, ensuring durability in harsh conditions. All products are made in the UK and distributed globally. - Direct replacement for the original exhaust system - Available in multiple configurations for sound customization - Constructed from 304L aircraft grade stainless steel - Manufactured in the UK and distributed worldwide Specifications: - Pipe Diameter: 57.15 - Installation Time: 1.5 to 2 hours (including removing OE system) - 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 - LH Rear Silencer - MSAU292 - RH Rear Silencer - MSAU293 - Brace Bar - MSAU314 Vehicle Compatibility: - 2004-2009 Audi S4 4.2 V8 quattro B7 Saloon/Sedan, Avant, Cabriolet