XFORCE - 2.5" Inch Oval Metallic Hi-Flow Racing Catalytic Converter (100 Cell) Hi-Flow Racing Metallic Catalytic ConverterOval Body 4" x 7"2.5" Inlet - (100 CELL)(Race or Off-Road Use Only) Maximize your vehicle's performance and minimize emissions with our high-quality, race or off-road use only, XFORCE - 2.5" Inch Oval Metallic Hi-Flow Racing Catalytic Converter (100 Cell). Designed with a 100 CELL Hi-Flow Racing Metallic Catalytic Converter, this product will not only enhance your vehicle's exhaust flow, but also reduce harmful pollutants by up to 90%. Upgrade to our oval body design with a 4" x 7" dimension and a 2.5" inlet for optimal efficiency and power.