hi i think it has a level 4 ecu chipped to 300bhp on a 3 door sierra, i want to make the engine bay look more standard so want to remove the big intercooler and replace with the standard item i dint know what a safe psi of boost would be with the standard intercooler, would it be able to run 20psi and also if you lower the boost on the actuator does the fueling need adjusting or is that all governed by the boost psi through the ecu itself so would not need attension, or how do you wire high and low boost in through the amal valve so it runs low boost until the boost is adjusted on the actuator, thanks