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 customization - Constructed from 304L aircraft grade stainless steel - Designed and manufactured in the UK Specifications: - Pipe Diameter: 70.00 - Race Product: No Kit comes with: - MSAU488: Y Pipe - MSAU488 - MSAU492: Polished GT (round) 80 Exhaust Tip, LH Twin Tip - MSAU492 - MSAU493: Polished GT (round) 80 Exhaust Tip, RH Twin Tip - MSAU493 - MSAU523: Connecting Pipe - MSAU523 - MSAU524: LH Rear Silencer Assembly - MSAU524 - MSAU525: RH Rear Silencer Assembly - MSAU525 - MSAU557: Adapter Pipe - MSAU557 Vehicle Compatibility: - 2009-2011 Audi A4 2.0 TDi B8 140PS / 177PS 2WD Saloon and Avant (S line models only) - 2009-2011 Audi A4 2.0 TDi B8 177PS quattro Saloon and Avant - 2007-2012 Audi A5 Coupe 2.0 TDi