Exhaust Manifold for 1999.5-2003 Ford 7.3L Powerstroke Diesel SPELAB Replacing or upgrading your exhaust manifold is necessary for both engine performance and sound. Whether on or off the track, the exhaust manifold provides more horsepower and improved exhaust sound. Fitment: Interchange P/N: F81Z9431AA, F81Z 9431 AA, F81Z9430AA, F81Z 9430 AA 1999.5-2003 Ford 7.3L Powerstroke Diesel Specifications: Brand Name: SPELABCertificate: ISO9001:2000Application: Automobile Exhaust ManifoldMaterial: Cast Iron Features: Tubular manifold design with better exhaust flow and delivers more top-end power Equal-length runners for balanced exhaust reversion and enhanced turbo performance Mandrel bent pipes to maintain the free flow Head flanges flattened by a hydraulic press to ensure a leak-free seal Chrome plating on flanges to increase corrosion resistance and surface hardness All joints TIG welded for great resistance against cracking and wearing