The range of cast downpipes offers enhancements to gas-flow and heat management, designed to increase efficiency and performance gains. The HJS High-Flow Sports Catalyst is a high-quality, high-performing aftermarket catalyst. The product is engineered to reduce 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. This results in a freer-flowing catalyst, improving gas-flow and performance. - Enhances gas-flow and heat management - HJS High-Flow Sports Catalyst maintains emission regulations - Reduces catalyst cell density for improved flow - Designed for increased efficiency and performance gains Specifications: - Pipe Diameter: 80.00 - Fitment Time: 1 to 1.5 hours (including removing OE system) - Race Product: Yes - EMarked: No Kit comes with: - F5146: Adaptor for UK/Euro Spec Vehicles - F5146 - MSBM421REP: 4.5" Decat Downpipe Vehicle Compatibility: - BMW 2 Series M240i Coupe (G42 XDrive OPF/GPF Models Only) 2022 and Later - BMW 3 Series G20 & G21 M340i XDrive Saloon & Touring (OPF/GPF Models Only) 2019 and Later - BMW 4 Series G22 M440i Coupe (OPF/GPF Equipped Models Only) 2020 and Later - BMW Z4 G29 3.0 I6 (B58) (OPF/GPF Models only) 2019 and Later - Toyota Supra A90 Coupe 3.0 Turbo (UK/European with OPF/GPF) - Both Auto & Manual Models 2019 and Later