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 to ensure durability in harsh conditions. The range is developed for a wide variety 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 customization - Constructed from 304L aircraft grade stainless steel - Made in the UK and distributed to over 90 countries Specifications: - Pipe Diameter: 70.00 - Installation Time: 2 to 2.5 hours (including removing OE system) - Race Product: No - EMarked: No Kit comes with: - LH Downpipe (non-resonated) - MSAU507REP - RH Downpipe (non-resonated) - MSAU508REP - LH Rear Silencer with Active Exhaust Valve - MSAU510 - RH Rear Silencer with Active Exhaust Valve - MSAU511 - Centre Silencer Delete Pipe - MSAU577REP Vehicle Compatibility: - 2012-2015 Audi RS4 B8 4.2 FSI quattro Avant