I first installed a EBC and i wasnt able to control boost properly.it was either to high boost or to low.i uninstalled and installed a MBC. its been going up between 20-21psi and falls to about 12psi. I've checked hoses and piping doesnt seem to be leaking. i connected everything back to stock and boost stays between 10-12psi no more no less. i finaly came to the conclusion it might be the BOV gone bad. anybodies help will be appreciated thank you.

 

my car does the same thing... Sum1 elses car did it too and they bought the stock vaccum setup that runs from the turbo and w/g acc. to the factory boost control soleniod and he said it fixed it and boosted normal again im about to go buy mine today... se i bought my car used and there is sumthin about if you have no b/c and the vaccum lines down there are ANY different than stock it won't boost right... for now i just got a MBC set on 17psi and said screw it! go buy stock vaccum hoses theyre like 13$