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 performance exhaust requirements. - Direct replacement for the original exhaust system - Available in multiple configurations for sound and tone customization - Manufactured from 304L aircraft grade stainless steel - Made in the UK and distributed to over 90 countries Specifications: - Pipe Diameter: 63.50 - Fitment Time: 1 to 1.5 hours (including removing OE system) - Race Product: No - EMarked: Yes - EMark Number: AudiS4S5B9 Kit comes with: - Cerakote Black GT (round) 90 Exhaust Tip, Standard - MSAU532 - LH Downpipe - MSAU693 - RH Downpipe - MSAU694 - Connecting Pipe - MSAU698 - LH Rear Silencer with Valve - MSAU699 - RH Rear Silencer with Valve - MSAU700 - LH Mounting Bracket - MSAU701 - RH Mounting Bracket - MSAU702 - Front Silencer - MSAU695 Vehicle Compatibility: - 2016 and later Audi S4 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (Non Sport Diff Models) - Left Hand Drive Cars Only - 2017 and later Audi S5 3.0 V6 Turbo Sportback B9 (Non Sport Diff Models Only) - Left Hand Drive Cars Only