NewSouth Performance has designed an insulating gasket that reduces the heat transfer from the cylinder head to the intake manifold.PowerGasket PlusÖ gives you up to 5% more power from your engine by reducing the temperature of the incoming air to your engine. This gives you cooler, denser air for more horsepower and performance from your engine. Intake manifold will remain 30-50? F cooler. Incoming air will remain 20-30? F cooler.