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, while 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 with reduced cell density for improved performance - Maintains emission regulations for daily usage - Milltek Sport is the exclusive UK distributor of HJS Tuning Catalysts Specifications: - Pipe Diameter: 80.00 - Fitment Time: 1 to 1.5 hours (including removal of OE system) - Race Product: Yes - EMarked: No Kit comes with: - F5147: Adaptor for US/ROW Cars - F5147 - MSBM421REP: 4.5" Decat Downpipe Vehicle Compatibility: - BMW 2 Series M240i Coupe (G42 XDrive - NAS Non OPF/GPF Models Only) 2022 and Later - BMW 3 Series G20 M340i Sedan including Xdrive (North American / ROW Models Only) 2021 and Later - BMW 4 Series G22 M440i Coupe (NAS/ROW Vehicles Only) 2021 and Later - Toyota Supra A90 Coupe 3.0 Turbo (USA/ROW without OPF/GPF) - Both Auto & Manual Models 2019 and Later