814116 Flowmaster's Scavenger Series Elite headers feature heavy duty 3/8 in. laser cut flanges, 16 gauge stainless steel primary pipes and gasket free ball flange exhaust connectors. Designed to compliment installations of modern GM LS-1 and LS-6 engines into popular Buick, Chevy, Oldsmobile and Pontiac muscle cars, these full length headers provide an exact fit and increased performance. Features: Gasket Free Ball Style Collectors Ceramic Coating Dyno Tuned For Maximum Performance Stainless Steel Construction O2 sensor wire extensions included About Flowmaster Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound. SPECS Attachment Method Ball & Socket Flange Automotive Item Grade High Performance Part Bolt Size M8 x 1.25 x 25mm Bolts/Studs Included Yes Brand Flowmaster CARB (California) Compliant No Collector Diameter 3.00 inch Collector Included Yes Color/Finish Silver Ceramic Emission Code 3 Engine GM Small Block Gen III/IV (LS Based) Header Finish Silver Ceramic Header Flange Thickness (in) 3/8 inch Header Series Scavenger Series Elite Header Style Long Tube Inlet Port Shape Round Material Stainless Steel Outlet Diameter (in) 3 Primary Tube Dia. 1-3/4 inch Product Type Headers Reducers Included Yes Tube Gauge 16 Tube Lengths Unequal Length UPC 700042028221 California Proposition 65 Chemical Name Chromium (hexavalent compounds) Nickel (Metallic) California Proposition 65 Required Yes Part Number 814116 Instructions for Part# 814116 Warranty for Part# 814116 Fits custom models from 1964 to 1972 including Chevrolet Chevelle and wagon, Buick Gran Sport, Skylark and wagon, Pontiac GTO and LeMans, Oldsmobile Cutlass and 442 with an LS1 or LS6 small block engine. Please note these headers are not emissions legal and are designed for off-road use only. Will not fit manual transmission cars with factory Z bar clutch linkage.