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Its not the oil. Go to an auto parts store and have someone pull the code. Post what it is and then go from there.

You should do some reasearch before declaring something no good. I agree that the price is higher, but you can install a cheap boost controller pre actuator and control when it opens. On my car in the same situation with the "cop", I can freely rev with nothing louder than factory.

Try this instead. Works off boost pressure. I have one on the way. http://www.atpturbo.com/root/releases/release091004.htm