Overview:Flowtech headers are the perfect combination of performance and value. Flowtech shorty headers are precision engineered using mandrel bent tubing, formed collectors and 5/16" flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat resistant black paint for a stealthy appearance.Features: Fuel Economy From The Engine Leak Test For Max Performance Mandrel-Formed Power Plenum Leakproof O-Ringed Port Seals Include All Mounting Hardware Constucted of .049 cold roll flash mild steel tubing Precision engineered for fit, performance and economy Application:UniversalSpecs: Brand Flowtech Collector Diameter 2.50 inch Emission Code 4 Engine Chevrolet Small Block Header Finish Black Paint Header Style Shorty Primary Tube Dia. 1-1/2 inch Product Type Headers Tube Material Mild Steel Warning California Proposition 65