here's a good one, put a HKS twin power box on my GTR R34 started it ran fine ,took it for a drive and lasted 15 mins came to a set of lights and was running on 4 cylinders,no power couldn't ever take of from the lights then died, would not start again. Call tow truck... Got home took of twin power put in standard harness and changed plugs nothing.... Replaces coils with splitfires still no spark, checked everything,fuses,wiring harness,relays,injector pulse all good. We suspect ecu so have sent it to CRD in Sydney for testing will let you know what it is but has everyone stumped. I live in Cairns so a pain in the rear to get anything done here, no one knows the Apexi FC.