Exhaust Header Manifold for 1937-1962 Chevy 6 Cylinder 216/235/261

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. FLASHARK 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: 1937-1962 Chevy 6 Cylinder 216/235/261 Specifications: Brand Name: FLASHARKModel: EH28160Certificate: ISO9001:2000Application: Automobile Exhaust HeaderMaterial: Stainless SteelSurface: Mirror PolishInlet: 2" x 1.65" (Rectangle) and 1.65" x 1.65" (Square)Outlet: 2" (Diameter)1-3/4" and 2" primary tubes7/16" thick head flangesCollector Diameter: 2.000"Flange Thickness: 0.310"Hardware Included: YesGasket(s) Included: YesNotes: 1.75" and 2.00" primary tubes. 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