not to crazy about 22-23 till i figure out what exactly the previous owner has done as far as tuning, because i've replaced what he took b4 the sale, besides that not to sure 18 psi's the stock psi. i was running the stock controller and it was hitting 12 every time. now with the perrin a tad turned up it's at 15, with no vacuum leaks. My question was safety wise, what is the safest psi to run b4 damage occurs? Instead of figuring it out on my own figured i'd ask to see if any of you know.