The range of cast downpipes is designed to enhance gas-flow and heat management, increasing efficiency and performance gains. The HJS high-flow sports catalyst is engineered for high quality and optimal aftermarket performance. This product reduces the density of OEM catalysts while maintaining emission regulations for daily use. Standard OEM catalysts typically have 500-600 cells, whereas the high-flow catalyst reduces this to 200 cells, resulting in improved gas-flow and performance. Milltek Sport is the sole UK distributor of HJS Tuning Catalysts. - Enhances gas-flow and heat management - High-flow catalyst reduces cell count to 200 for improved performance - Maintains emission regulations for daily usage - Distributed to more than 90 countries worldwide Specifications: - Pipe Diameter: 80.00 - Fitment Time: 4.5 to 5 hours (including removing OE system) - Race Product: Yes - EMarked: No Kit comes with: - MSAU757: Heat Wrapped 200CPSI Cat Downpipe with OPF Bypass (LH) - MSAU758: Heat Wrapped 200CPSI Cat Downpipe with OPF Bypass (RH) - MSAU759: LH Connecting Pipe (To Milltek OPF Back System) - MSAU760: RH Connecting Pipe (To Milltek OPF Back System) - MSAU792: Downpipe Fitting Kit for Non OPF Cars Vehicle Compatibility: - 2020 and later Audi RS6 C8 4.0 V8 bi-turbo Performance Edition (Non OPF/GPF Models - USA/ROW Models) - 2019 and later Audi RS7 C8 4.0 V8 bi-turbo (Non OPF/GPF US/ROW Models) - 2020 and later Audi S8 D5 4.0 TFSI V8 Saloon / Sedan - Long Wheel Base (Non OPF/GPF US/ROW Models) - 2020 and later Audi S8 D5 4.0 TFSI V8 Saloon / Sedan - Standard Wheel Base (Non OPF/GPF US/ROW Models)