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 - Manufactured in the UK and distributed globally Specifications: - Pipe Diameter: 63.50 - Race Product: No - EMarked: Yes - EMark Number: RS4B5 Kit comes with: - Centre Silencer - MSAU131 - Rear Silencer - MSAU132 - Resonated Link Pipe - MSAU144 Vehicle Compatibility: - Audi RS4 B5 V6 Bi-Turbo Avant 2000-2002 - Audi S4 2.7T quattro B5 1997-2001