The NRG High Pressure Radiator Cap was designed to reduce under hood temperatures by increasing and maintaining the internal water pressure of your vehicles cooling system. Through the utilization of a stiffer valve spring in the cap housing, the waters boiling point is increase, as well as the cooling efficiency of the coolant. A cooler running motor will be more efficient, resulting in increased power and performance. Available in low or high radiator mounting positions. Features 1.3 Bar pressure hold.