I will have to say ahead of time, i am no expert bout car and probably the dumbest person to ask this question, i have ebc profic II at the moment, car tuned with nistune...it had 13 psi (1 bar) or 66% set on it... Had problem on that setting so i turned the % down to 61% which is 12 psi or .90 bar and now its running fine.. Turned it down more to %56 = 11 psi Or .80 bar.. Correct me if im wrong on the figures.. Now my question is , i thought to be able to turn the boost up or down u need a tuner to do it?? So if u have boost controller , either manual or ebc, u can actually do it urself?? I guess thats why its called electronic boost controller!!