Toyota Celica GT4 ST165 engine management modifications
Toyota Celica GT4 ST165 engine management modifications 165 Engine Management Before you go any further please read the notes ECU Price Benefit Drawback Notes Stock Inside Outside GBP0 Already installed Reliable No expense Only programmed with fuel/ignition maps up to a certain level. 165/185 ~12psi, CS/RC ~17psi, 205 ~17psi Need an aftermarket ECU to safely get the most from the engine Still got the AFM, 165/185 Ok providing you don't go mad i.e.