So I went to Nappa and got a new turbo to dp gasket. The gasket is paper outside with thin metal underneath. Though the there is a blunt metal ring around the 2inch opening, it still fits fine. Well bore I couldn't boost under 15psi. Now I can't boost over 11psi! Wtf mate? I always thought it was my turboxs boost controller.

What kind of exhaust housing are you running?

all HRC stuff except for that gasket I got from Nappa.

Is the opening of the gasket the same size or larger than the outlet size of the turbo? If its smaller, then that prob isn't too good,but i don't think that would cause a boost issue..Check your MBC, and also check for boost leaks..I had my Hallman MBC get whacked out before, and it would go down on its boost setting..i took it off,and could blow though it a little bit..not supposed to do that..took it apart and cleaned it, and it worked fine ever since..maybe try that too if you dont find anything else wrong

Thanks Matt. As always you're da MAN! The opening on the gasket is larger than the piping. Tomorrow I shall clean the boost controller.