Mishimoto MMTS-F2D-03H Ford 6.0L Powerstroke High-Temperature Thermostat, 2003-2007 Direct fit for the 20032007 Ford 6.0L Powerstroke Higher activation temp restricts coolant flow for quicker engine warm-up Ideal for use in cold climates Mishimoto Activation: 200F (93C) / OEM Activation: 192F (89C) Mishimoto Lifetime Warranty