I haven't taken it all the way to redline in 1st yet but it feels as if it would make it all the way to the maximum standard boost, but the gearing is different so the load is not as high. The boost solenoid is connected so i should have standard boost. The only other thing i can think of is the boost sensor which operates the standard boost guage in the dash, which i removed to fit an aftermarket guage, but due to the wiring i assume this has no input to the ecu