SPELAB Exhaust Header for 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Subaru Impreza 2.5L Racing Fitment: 1997-2005 Impreza RS Legacy GT Header1998 RS Coupe 2D 2.5L DOHC1999-2001 RS Coupe 2D 2.5L SOHC2001-2005 RS Senda 4D 2.5L SOHC2002-2004 TS Wagon 4D 2.5L SOHC2002-2004 Outback Wagon 4D 2.5L SOHC2005 RS Wagon 4D 2.5L SOHC2005 Outback Sport Wagon 4D 2.5L SOHC1997-2005 Subaru Legacy GT 2.5L 4DR Wagon w/o Oil Cooler Specifications: Brand Name: SPELABCertificate: ISO9001:2000Application: Automobile Exhaust HeaderMaterial: Stainless SteelSurface: Mirror PolishModel: EH28062Header Inlet/Outlet Size (IN): 1.50"/ 2.25"Increase 15-25 HP 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. 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.