The Sinister Diesel Thermostat Housing is a drop-in replacement for the OEM housing, with several advantages. It's anodized billet aluminum construction resists corrosion that often plagues OEM units. The Precision CNC machining and thick base plate ensure a complete seal for years to come. It's finished off in our Signature Sinister Blue to add some great looks to your engine bay. NOTE: This thermostat housing is NOT compatible with Mishimoto thermostats, Features: 6061 T6 Billet Aluminum Construction, Longer life with a leak-proof seal, Tough, heat-resistant design, Blue Anodized FinishIncludes: (1) Sinister Diesel Thermostat Housing, (3) Hardware Bolts.Thermostat Housing for 1999-2003 Ford Powerstroke 7.3L.Thermostat HousingProp 65 (C, R or CR): CRProp 65 - Short Label: P65_Warning.jpgProp 65 Yes/No: YesTitle: Sinister Diesel Thermostat Housing for 1999-2003 Ford Powerstroke 7.3L