Mishimoto Silver MMTS-F2D-08L Ford 6.4L Powerstroke Low-Temperature Thermostats (Set of 2), 2008-2010 Direct fit for the 20082010 Ford 6.4L 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: 187F/197F (86C/91.5C) / OEM Activation: 192F/203F (89C/95C) Mishimoto Lifetime Warranty