Mishimoto MMTS-F2D-03L Ford 6.0L Powerstroke Low-Temperature Thermostat, 2003-2007 Direct fit for the 20032007 Ford 6.0L Powerstroke Lower activation temp allows coolant to flow through the engine earlier Ideal for vehicles in warm climates or under extreme towing/driving conditions Mishimoto Activation: 185F (85C) / OEM Activation: 192F (89C) Mishimoto Lifetime Warranty