Buy the D1SC, The P1SC is a great blower but is not effecient at higher boost levels. 13psi is really idealy the max for them. I have seen people go to 15-16psi and that is making that baby spin like a banshee and I know some one who spun it to 18 and I was surprised the damn blower didnt turn bright red as hot as it got.
Great blower though I am running my P1SC and making around 600rwhp. It wasnt exactly that but sense its not my final numbers I didnt car to remember it. The nice thing with the Prochargers is that it is easy to upgrade. You can send the P1SC and turn it into the D1SC or do a direct upgrade to an F1/A.
I am hoping to have a F1/C on my car soon if this guy dirtydog doesnt sale his before I can get the money.
If you still havent pulled the trigger yet and when I move to SD this Aug I will give you a ride in my car and you can see what its like. There is no traction in 1st gear and if i punch it in 2nd gear once I hit 4500 rpms my tires lite up.