Stage II (160cc) injectors aren't gonna get you there. (500 hp). Close, but not there.
From my signature you can see I had the stage II's with the S468 turbo and that thing was a mean SOB. Not the fastest truck on the street by any means, but I could roll my 37's on dry pavement with a little launch and could break them loose in the rain at 50 mph going up a hill.
The S468 was a touch laggy down low with the Stage II's, but when it lit.... Hold on!
Also, the EGT's never got above 1200 when wide open except on the shift. I'm running 3:73 gears, so that doesn't help the problem.
If you ever plan on more power than the Stage II's, I'd go with the S468. That is a turbo that will support 700 hp+. Also, I'd get a small set of hybrids.
Good Luck and thank god you have forged rods..... LOL
I didn't and now I'm driving a car for awhile.
Ryan