It help when you tracking your car. When you go extreme, the radiator pressure can go very high, to the point where the pressure is above the std cap can handle. So if thats what happened to your car, you grab those higher rate cap. Other than that, it doesn't do anything. You want cooler tempt, grab trd thermostat. It keeps your needle at 1/4 i was told by pippy. That sound pretty cool to me.