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I have pullies, o/r x, flowmasters, and Anderson Ford Motorsport Powerpipe and an 82mm mass air and I put down 423rwhp and 488 rwtq on a 150 dry shot, motor is completely internally stock. Tuned by Anderson Ford Motorsport using the PMS stand alone.
I'm running a Vortech V2-E with 8lbs on my 01 (42lb injectors, SLP Exhaust, 3.73 gears(gearing doesn't matter of course) and dynoed @ 427rwhp and 464rwtq
It should put you over 400 easy and 8psi isn't really pushing it tooo much but look out and get it tuned right my buddies went lean with his tune trying to push more hp out and adding timing and burnt a hole through his piston...