hi all, a freind of mine has got a 93 jap wrx with hks exhaust, filter, and blow off valve. hes not had it long and did not know much about them when he got it. problem is he took me out in it the other day and i noticed that the boost gauge is only reaching .5 bar. he thought it was ok but i told him that standard it should be running at .8-.9 bar. any ideas if this is a problem or not.
many thanks.

 

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