HKS FCD (Fuel Cut Defencer)The HKS FCD is an electronic device developed to properly raise the factory fuel cut level on factory turbocharged vehicles. As modifications are made to optimize engine performance, the factory fuel cut is often triggered by higher boost levels which activate a fuel delivery cut off as a failsafe procedure. Symptoms of fuel cut are hesitation, bogging, and or illumination of diagnostic indicators. Standard model. Call for Vehicle Specific.