Mishimoto MMTS-RAM-99L Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat, 1999-2013 Direct fit for 19992013 Dodge Ram with 5.9L/6.7L Cummins 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: 180F (82C) / OEM Activation: 190F (87.5C) Mishimoto Lifetime Warranty