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. Performance exhaust systems are developed for a wide range of vehicles, with ongoing research and development to meet evolving requirements. All products are made in the UK and distributed globally. - Direct replacement for the original exhaust system - Available in multiple configurations for sound and tone customization - Manufactured from 304L aircraft grade stainless steel - Designed for durability in harsh conditions Specifications: - Pipe Diameter: 70.00 - Installation Time: 2 to 2.5 hours (including removal of OE system) - Race Product: No - EMarked: Yes - EMark Number: AudiRS4RSB9 Kit comes with: - LH Lower Downpipe - MSAU723 - RH Lower Downpipe - MSAU724 - Front Silencer - MSAU726 - Centre Silencer - MSAU727 - LH Rear Silencer (ECE) Valved - MSAU730 - RH Rear Silencer (ECE) Valved - MSAU731 - Polished Jet (oval) 170 x 107 Exhaust Tip, LH - MSTIP246 - Polished Jet (oval) 170 x 107 Exhaust Tip, RH - MSTIP247 Vehicle Compatibility: - Audi RS4 B9 2.9 V6 Turbo Avant (Non OPF/GPF Models) 2018 and later