MACE MANIFOLD INSULATOR TO SUIT FORD FAIRLANE BA BF BARRA 220 230 5.4L V8Exclusive to MACE Engineering, our design registered 6. 35mm (1 4") manifold insulator to suit Ford Barra 220 and 230 V8 engines. Key benefits: Produces a cooler intake charge resulting in more power A cooler intake charge also reduces the tendency for detonation, means more ignition timing boost for more power! Improves low end torque by increasing runner length Better fuel economy Robust insulator material allows it to be re useable No undesirable