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Thanks I will do some more research. I'll probably hold out until I get my exhaust and intake set up first.

Thanks. I was thinking 9 or 10 psi anyway.

I just bought a 2003 msp and love it. I also just bought a universal boost control for it. The instructions are horrible. Does anyone have any tips or a how to for a manual boost control? Also what should I put the boost at on a stock mazdaspeed protege? This is the first car I've ever had with...