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 and tone. All products are manufactured from 304L aircraft grade stainless steel, ensuring durability in harsh conditions. These performance exhaust systems are developed for a wide range of vehicles, with ongoing research and development to meet evolving performance requirements. 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 - Manufactured from 304L aircraft grade stainless steel - Made in the UK and distributed globally Specifications: - Pipe Diameter: 70.00 - Installation Time: 2 to 2.5 hours (including removal of OE system) - Race Product: No - EMarked: Yes - EMark Number: e24*70/157*2007/34*1918*00 Kit comes with: - MSAU507: LH Downpipe (resonated) - MSAU507 - MSAU508: RH Downpipe (resonated) - MSAU508 - MSAU510: LH Rear Silencer with Active Exhaust Valve - MSAU510 - MSAU511: RH Rear Silencer with Active Exhaust Valve - MSAU511 - MSAU577: Centre Silencer - MSAU577 Vehicle Compatibility: - 2012-2015 Audi RS4 B8 4.2 FSI quattro Avant