how accurate is the stock boost gauge on 02 wrx? is it a real boost gauge or is it just for show? 3000gt vr4 has one, but it is not a real one and work with maf sensor only. also is stock bov good for 15-16 psi. we have a stock 02 wrx and we are thinking to up the boost to about 1 bar, but not sure i can trust the stock boost gauge. the car also has catback and cold air intake on it.

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