1997-2003 Ford F150 F250 Expedition 4.6L V8 Exhaust Header

Fitment: 1997 - 2002 Ford Expedition 4.6L V81997 - 1999 Ford F-250 4.6L V81997 - 2003 Ford F-150 4.6L V8(except 1997 Ford f150 3 door 4.6 V8, 2001 Ford F-150 Lariat 4-Door 4.6L) Specifications: Brand Name: FLASHARKCertificate: ISO9001:2000Application: Automobile Exhaust HeaderMaterial: Stainless SteelSurface: Mirror PolishModel: EH28711Inlet/Outlet: 1.50/2.00" 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 exha