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. Manufactured from 304L aircraft grade stainless steel, these systems are built to withstand harsh conditions. 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 sound and tone customization - Constructed from 304L aircraft grade stainless steel - Made in the UK and distributed globally Specifications: - Pipe Diameter: 63.50 - Fitment Time: 1 to 1.5 hours (including removing OE system) - Race Product: No - EMarked: No Kit comes with: - MSAU693: LH Downpipe - MSAU693 - MSAU694: RH Downpipe - MSAU694 - MSAU696: LH Front Silencer Rep Pipe - MSAU696 - MSAU697: RH Front Silencer Rep Pipe - MSAU697 - MSAU711: Connecting Pipe - MSAU711 - MSAU712: LH Rear Silencer with Valve - MSAU712 - MSAU713: RH Rear Silencer with Valve - MSAU713 - MSVW373: Polished GT (round) 100 Exhaust Tip, Standard - MSVW373 - MSAU701: LH Mounting Bracket - MSAU701 - MSAU702: RH Mounting Bracket - MSAU702 Vehicle Compatibility: - 2016 and later Audi S4 3.0 Turbo V6 B9 Saloon/Sedan & Avant (Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only - 2017 and later Audi S5 3.0 V6 Turbo Sportback B9 (Sport Diff Models Only & without Brace Bars) - Left Hand Drive Cars Only