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cincytt did a complete write up on mbc, boost gauge, and diode mod so you can use the mbc until you get a chip or go bt its in the DIY section. And if your boost gauge doesnt show vac and only press...get one that does.
And are you tuned, do you have a chip etc?? if you dont you cant use a mbc.
get a TUNE, look in the classifieds you can get speed tuning for uber cheap, or k0mpressed on az tunes cars.... giac apr uni... i would stay away from nuspeed