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 - Manufactured 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 removal of OE system) - Race Product: No - EMarked: Yes - EMark Number: AudiS4S5B9 Kit comes with: - MSAU693: LH Downpipe - MSAU693 - MSAU694: RH Downpipe - MSAU694 - MSAU695: Front Silencer - MSAU695 - MSAU701: LH Mounting Bracket - MSAU701 - MSAU702: RH Mounting Bracket - MSAU702 - MSAU711: Connecting Pipe - MSAU711 - MSAU712: LH Rear Silencer with Valve - MSAU712 - MSAU713: RH Rear Silencer with Valve - MSAU713 - MSVW374: Brushed Titanium GT (round) 100 Exhaust Tip, Standard - MSVW374 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