P1SC Procharger and a 408
procharger will take your p1sc and turn it into a d1sc(new label and internals) for around $1400
i dont see why you shouldnt be able to gain an extra 150 or more hp before it runs out of air
someone a little more experienced will chime in soon im sure
Take a look at this T/A, which has a 408 with a D-1SC. We got 16 psi out of it, with the P-1SC I'd say you would see 12 psi or so. 600 rwhp would indeed be possible. Bob


