Mishimoto MMTS-F2D-03FH Silver High-Temperature Thermostat/CNC Housing for Ford 6.0L Powerstroke Engine Direct fit for the 20032007 Ford 6.0L Powerstroke 6061 CNC-machined aluminum housing includes pre-installed high-temp thermostat Higher activation temp restricts coolant flow for quicker engine warm-up Mishimoto Activation: 200F (93C) / OEM Activation: 192F (89C) Mishimoto Lifetime Warranty