SPELAB Exhaust Header for 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,1996,1997 Chevy GMC Truck 305 350 5.0/5.7L 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:92-94 Chevrolet Blazer 5.0L 5.7L Small Block V888-95 Chevrolet C1500/ C2500/ C3500/ K1500/ K2500/ K3500 5.0L 5.7L Small Block V892-95 Chevrolet C1500/ C2500/ K1500/ K2500 Suburban 5.0L 5.7L Small Block V81988 Chevrolet R30/ V30 5.0L 5.7L Small Block V81989 Chevrolet R3500/ V3500 5.0L 5.7L Small Block V81995 Chevrolet Tahoe 5.0L 5.7L Small Block V888-95 GMC C1500/ C3500/ K1500/ K2500/ K3500 5.0L 5.7L Small Block V888-97 GMC C2500 5.0L 5.7L Small Block V892-95 GMC C1500/ C2500/ K1500/ K2500 Suburban 5.0L 5.7L Small Block V888-89 GMC R3500/ V3500 5.0L 5.7L Small Block V892-95 GMC Yukon 5.0L 5.7L Small Block V8 Specifications: Brand Name: SPELABCertificate: ISO9001:2000Application: Automobile Exhaust HeaderMaterial: Stainless SteelSurface: Mirror PolishModel:?EH28022 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.