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 for durability in harsh conditions. Performance exhaust systems are available for a wide range of vehicles. 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 - Manufactured from 304L aircraft grade stainless steel - Made in the UK and distributed globally Specifications: - Pipe Diameter: 70.00 - Installation Time: 2 to 2.5 hours (including removing OE system) - Race Product: No - EMarked: Yes - EMark Number: AudiRS4RSB9 Kit comes with: - MSAU723: LH Lower Downpipe - MSAU723 - MSAU724: RH Lower Downpipe - MSAU724 - MSAU725: Front Silencer - MSAU725 - MSAU727: Centre Silencer - MSAU727 - MSAU730: LH Rear Silencer (ECE) Valved - MSAU730 - MSAU731: RH Rear Silencer (ECE) Valved - MSAU731 - MSTIP259: Brushed Titanium Jet (Oval) 170 x 107 Exhaust Tip - MSTIP259 - MSTIP260: Brushed Titanium Jet (Oval) 170 x 107 Exhaust Tip - MSTIP260 Vehicle Compatibility: - Audi RS5 B9 2.9 V6 Turbo Coupe (Non OPF/GPF Models) 2017, 2019