Need info for my 95mustang

I have a 95 mustang and i have a novi 2000 with air-air intercooler. Right now I am running a 3.25 pulley and I am seeing 11lbs of boost. I would like to see more than that as I just got an aftermarket block. Then again, I don't want belt slip. I don't have any now on the 3.25

Whats the best way to increase my boost?? Is there a larger crank pulley I can use? If so, how much boost would I gain by switching to it. Or should I just step down another size on the upper pulley? That would be a 3.00 right?


Lastly, I have a standard novi 2000 kit. Whats the deal with the extrude honed volute?? Would it benefit me?