Sikky Manufacturing - S13 240sx KA24DE Heat Shielding Intake Manifold Gasket (SM-TN-020)Fits 1991 1994 Nissan 240sx S13 with KA24DE (DOHC) engine. About Thermalnator Heat Shield Gaskets Thermalnator is a unique high temperature shielding gasket which replaces the stock intake manifold gasket. Thermalnators cooling properties reduce heat by stopping metal to metal contact between the intake manifold and the engine block. By using a Thermalnator gasket, you will reduce the heat of the air entering your engine, making up to 5% more power.