Stock I was putting up 19psi unloaded. With my DP-Tuner on 40 setting I've hit 23#'s towing a trailer uphill, 80 setting I've hit 27#'s, and the 120 setting I've hit 31 once, just to say I could. Right now I've set my wastegate to limit my boost to 26#'s. I just don't feel like destroying my turbo.

Going over 25#'s on a stock turbo really doesn't do much good. Not just for the turbo itself, but for power overall. The turbine side of the turbo has more than double the pressure of the compressor side at higher boost levels.