Quote:
Originally Posted by 07ImprezaMB
You would never get away running that much boost on stock heads with stock cams. You would only be able to run 10-12 psi with upgraded pistons. In order for you your heads to run more boost you would need to upgrade your cams and valvetrain.
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You can run 12+ boost with stock heads, subies out there running 20+ boost, and I am going to run soon 18psi on my SOHC heads, the limiting factor is pistons, NA pistons just don't cut it for boost.