Low temp thermostat: The Supercharged 3.8 motor in the 97\98 Grand Prix's use a 195 degree thermostat. The thermostat opens from the motor to the cooling system. By replacing it with a lower degree thermostat the fluid flow is opened sooner and begins to cool the car sooner and faster. Stant makes a 180 degree thermostat and is available at most auto parts stores for around $7.00. Ram Air Technology also distributes a 180 degree thermostat for $9.99 plus shipping. There is a very little increase in horsepower the real benefit is a cooler running engine and more consistent track runs.
Ram Air Technology 714-901-9101