High temperatures and steep inclines tax your engine, especially if you've engineered it for high performance. Our F-350 thermostats are manufactured by industry-leader Hypertech and are available in 160 degree and 180 degree models for colder climates. They simply replace the factory thermostat, requiring no special modifications to your vehicle. Plus, our Ford F-350 thermostats are legal in all 50 states when used in conjunction with Hypertech power tuning. At AutoAnything, all of our F-350 thermostats ship for free - with no minimum order required - and come backed by a 1-year low-price guarantee, in addition to the manufacturer's warranty. If you find the same part cheaper anywhere else, we'll meet and beat that price by a dollar.