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I have a high psi spring holding my wastegate shut...the turbo controller arm broke in half (idfk how) but I just have a spring hooked onto my intake holding the lever forward, very hobo fix but it builds right around 12 psi of boost and it is louder than any 6.5 with a GM-4 turbo I've ever heard. Comparable to the turbo noise of a 6.0 powerstroke! It turns heads in town