4138 posts · Joined 2014. #2 · Jul 30, 2015. If his is holding boost that high its more than likely been remaped. Your boost if not remaped should boost to just below or in the red and settle at half. Boost is restricted in 1st and 2nd on these cars to prevent damage. Change the solenoid and if that doesn't work I'd look at MAP sensor or
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