Mishimoto MMTS-RAM-99H Dodge 5.9L/6.7L Cummins High-Temperature Thermostat, 1999-2013 Direct fit for 19992013 Dodge Ram with 5.9L/6.7L Cummins Higher activation temp restricts coolant flow for quicker engine warm-up Ideal for use in cold climates Mishimoto Activation: 205F (96C) / OEM Activation: 190F (87.5C) Mishimoto Lifetime Warranty