SPELAB Exhaust Header for 1923-1967 Chevrolet LS Universal Swap Conversion LS1 LS2 LS3 LS6 Replacing or upgrading your exhaust header is necessary for both engine performance and sound. Whether on or off the track, exhaust headers provide more horsepower and improved exhaust sound. SPELAB offers many products to help you create your own custom engine headers. It's really easy and convenient to use: direct bolt-on, no modification needed. Fitment: LS Universal Swap Conversion LS1 LS2 LS3 LS6 1923-1954 Chevrolet Cars & Trucks1923-1954 Cadillac Cars1958-1964 Chevrolet Impala & Biscayne1950-1964 Chevrolet Bel Air1953-1967 Chevrolet Corvette1955-1961 Chevrolet NomadFor LS series engine swaps only" These do not work on standard SBC or BBC Specifications: Brand Name: SPELABCertificate: ISO9001:2000Application: Automobile Exhaust HeaderMaterial: Stainless SteelSurface: Mirror PolishModel:?EH28955 Exhaust Header VS Manifold, which is the better choice? The structural differences between exhaust headers and manifolds are the material and size. From the material, exhaust headers are made of lighter, thinner steel, while exhaust manifolds are made of thick iron. Exhaust headers are also longer than exhaust manifolds. When in use, exhaust manifolds create back pressure, which lowers performance. Because each cylinder of the engine is given its own tube, however, headers eliminate this problem; thus, allowing the gases to exit without the creation of back pressure. Therefore, exhaust headers are a BETTER choice than an exhaust manifold.