Electronic Fuel Cut Defender Defencer FCD For HKS Mazda MX6 RX7 S4 S5 S6 626 USAElectronic Fuel Cut Defender Defencer FCD For HKS Mazda MX6 RX7 S4 S5 S6 626 Most late model cars have in built defence mechanisms to guard against increases in boost pressure. Such systems are important but can be an obstacle when increasing boost pressure. The FCD2 will allow boost pressure to be increases above the factory level and prevent momentary shutdown of the fuel injection system. IMPORTANT NOTES ON YOUR BOOST CONTROLLER Once the fuel cut