MACE 12MM MANIFOLD INSULATOR KIT TO SUIT HSV COUPE V2 VZ LS1 LS2 5.7L 6.0L V8This Mace 12mm Manifold insulator kit suits HSV ClubSports and similar platforms fitted with LS1 LS2 5. 7L & 6. 0L V8 engines. Manifold insulator helps to reduce the heat transfer from the engine to the intake manifold by spacing it up off the valley of the engine. Made from thermal composite material, this insulator will increase the engine power by keeping the intake cooler and increase low end torque by increasing runner length. Key Features: