Ive run 24-25psi with good trims and no issues, there are others that have cranked the boost up on 3+ kits to 28-30psi and have been ok
I think I just gave GUST more headroom last night. I was talking to Frank Mabo (a guy online that tunes Eurodyne and who is tuning Gustavo's car) about boost control, and after a while I finally realized he is NOT in the US. In case anyone was wondering, ROW cars stock had a A/F of 11.5, where US cars have an A/F stock of 13.1.
I send him some logs and he was telling me that 12.5 was incredibly lean. I was super confused for like 20 minutes until I figured the above fact out.