I run 14psi in low for normal driving and summer. And 16 in high for winter/cool nights. With stock ICs. Look at my profile for more and previouos posts for my dyno sheets. I could get more PSI with larger intercoolers but I like the dependability of running lower boost. I do not want to push my baby to her limits of PSI like I know I would with larger ICs, especially here in Texas where it gets HOT! I personally think water injection is a better mod for my/our situation, if you don't mind the potential for failure of such a complicated system (water leaks, electrical probs. running out of water, etc) I am leaning toward water even more with the ethonal gas thing as of late.