Mishimoto MMTS-MUS-86A Ford Mustang GT/Cobra Street Thermostat, 1986-1995 Fits the 19861995 Ford Mustang GT/Cobra Lower activation temp allows coolant to flow through the engine earlier Maintains lower temperatures and extends engine life Mishimoto Activation: 179.6F (82C) / OEM Activation: 190.4F (88C) Mishimoto Lifetime Warranty OEM thermostat activates at 88 degree Celsius Mishimoto thermostat activates at 82 degree Celsius Greater cooling efficiency