Overview: Flowtech headers are the perfect combination of performance and value. Flowtech long tube 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 and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance. Features: Fuel Economy From The Engine Leak Test For Max Performance Ceramic Headers Rust And Corrosion Resistance Mandrel-Formed Power Plenum Leakproof O-Ringed Port Seals Include All Mounting Hardware Application: 1970-1974 Pontiac Firebird 1964-1973 Pontiac GTO 1968-1974 Pontiac LeMans 1973-1974 Pontiac Grand Am Specs: Brand Flowtech Collector Diameter 3.00 inch Emission Code 4 Header Finish Silver Ceramic Header Style Long Tube Primary Tube Dia. 1-5/8 inch Product Type Headers Tube Material Mild Steel Warning California Proposition 65