The early 6.0 Powerstroke engines were plagued with overheating issues mostly revolving around the fact that they use a plastic impeller in the factory design. The plastic OEM water pump impellers in the 6.0 Powerstroke have been known to crack along the hub, leading to overheating and potentially very expensive repairs. The Sinister Diesel Billet Water Pump is built with ultimate reliability in mind. It features a CNC machined billet aluminum impeller to resist cracking or flexing under load. The pump housing itself is also CNC machined from billet aluminum for to resist flexing or warping for a reliable seal and to eliminate leaks. It even has a high performance bearing assembly and seal so you know you can rely on it for years to come. To finish it off, Sinister anodizes their housings in Sinister Blue for for a beautiful corrosion resistant finish. Sinister stands behind their product with a 2-Year/Unlimited Mile warranty.