Skunk2's thermal intake manifold gasket for VW MK4 small-port heads uses a high-temperature thermal polymer to reduce heat transfer into the intake and minimize heat soak. Sold as a direct replacement for OEM MK4 small-port gaskets, it lowers incoming air temperatures and, according to the manufacturer, can contribute to measurable power gains by keeping intake charge cooler under demanding conditions.
Skunk2 Volkswagen MK4 Small Port Thermal Intake Manifold Gasket