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 performance exhaust systems are produced in the UK and distributed globally. - Direct replacement for the original exhaust system - Available in multiple configurations for sound customization - Constructed from 304L aircraft grade stainless steel - Designed and manufactured in the UK Specifications: - Pipe Diameter: 63.50 - Race Product: No - EMarked: No Kit comes with: - MSAU130: Non-Resonated Link Pipes - MSAU131: Centre Silencer - MSAU131 - MSAU132: Rear Silencer - MSAU132 Vehicle Compatibility: - 2000-2002 Audi RS4 B5 V6 Bi-Turbo Avant - 1997-2001 Audi S4 2.7T quattro B5