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It all depends on the rest of your setup, but the stock 3.47" (I think) pulley makes about 8 psi, and you go up 1-2 psi for every size smaller. But lots of stuff can play into that, like whether you have long tube headers, the size of your crank pulley, etc.
+1 Generally, one size drop will be 1-2 psi difference at the blower. But the net effect will vary depending on the rest of your system.
I have a 3.12 6-rib vortech pulley I'm getting ready to sell.
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Mike - 2005 V6 Automatic, 300+ RWHP; 12.79 1/4
Vortech supercharger (SOLD); 180*T-stat; PLX Wideband O2, VEI digital gauges, SOS pillar pod; JBA 9MM wires; Mac LT headers, high flow cats; 8.8 w/3.73s, LPW girdle, alum driveshaft, 3000rpm TC; Steeda UCA, panhard bar, brace; CHE lca's & reloc brackets; Steeda Sport springs, Tokico DSpecs. .. "Sally" is getting "balls" ...forged V8 swap in progress
pulley size doesnt always = set PSI, too many variables to be accounted for
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Tngstn 06GT-5 spd -Vortech HO S/C-Tuned by Realspeed Auto
You can never have too much power, just not enough traction. 11.867 @ 119.35
stkjock what all do you have done to your car? I have an aunt in east hampton if i cant find a place close to home to get a tune, when I come visit her I may have to hit you up for some advice on a good place to go down that way.
IMHO - best shop on LI for a 3V tune is Realspeed in Bohemia. They have done all my work
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Tngstn 06GT-5 spd -Vortech HO S/C-Tuned by Realspeed Auto
You can never have too much power, just not enough traction. 11.867 @ 119.35
i am located about 5hrs away. But the closest shop that does good work is about 3.5-4hrs from here. I have not found anyone that knows of a shop closer. I am located in the corning elmira area.
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vortech pulleys
.. "Sally" is getting "balls" ...forged V8 swap in progress 
