This is a 160 Degree Powerstat Thermostat. It will help improve your performance in 2 ways. First by increasing less heat into the intake air and second by reducing the engines tendency to detonate. The cooler your LS1 runs the more horsepower it will make.
This 160 Degree Thermostat will fit your 98-02 Camaro, SS, Z28, RS, Firebird, Trans Am, Ram Air, Formula or FIrehawk.