Also don't loose too much sleep over the actual boost level, its more the fueling that makes a difference. You can install an inline waste gate adjuster and make it push 15lbs of boost with stock fueling but have no improvment in performance. Turn the fuel up untill the 15lbs doesn't clean up all the smoke, and then back off the fuel screw untill it just has maybe a light haze at full throttle and boost, then you are using all the fuel your injecting, and utilizing the 15lbs of boost. If you did a different intercooler, I wouldn't hesitate to push up to 20lbs of boost. I ran 25lbs for a year and a half before my head gasket let go (stock gasket with bolts) and it was a ROUGH year and a half. More conservative fueling and about 20lbs of boost would net you a nice increase in power.
Jason
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