monkey hit it dead on... i'd probably go with a vortech money wise because you can find them for cheap whereas the procharger you'd probably have to buy new straight from procharger. if money was no object i'd go with procharger though.
I Have the procharger with 13psi and very well built 3.8 engine and I am pushing 330 to the rear and running very rich. I tried vortec 6- 7psi and it was alright I spent my money on procharger all I am waiting on is ford chip becuase they are dam slow.
Oh, btw, guy told me he'd ship today or tomorrow. W00T! Of course, can't do crap until I get a chip ordered anyway...which I have no idea when I'm going to do that or when I'll get the extra $350-$400!. Pray for me Brother Corey that God will supply some extra cash and not smite me for not paying off my debtors but using it for a freakin chip!