Procharger pulley Question
 

Removed procharged today to change oil and belt....I have the 3.4"pulley on there but I am only hitting 10psi...mods in sig.......is that normal? I did some searches and saw people hitting 16psi with that pully.......I have 6 rib by the way....

I would say your belt is slipping. The 6-ribs are notorious for that, especially on D1SC.

I'd say you're definitely seeing belt slip. I get 10# with a 4.1, but I also have a MMS crank pulley

Keep in mind the six rib kits have a smaller diameter ProCharger crank pulley. My old six rib kit was at 7 psi with a 4.00 blower pulley on a stock engine with headers and exhaust.
5.82" crank pulley on the six rib, compared to a 7.65" on the eight rib. This makes a huge difference! Bob

Time to step up to the 8 rib assembly.