10PSI-12PSI so be safe. Throw some DET pistons in there and you can run more. 15-16 is my guess.
T2 turbos produce alot of heat, and is bad on the stock VE pistons. That's the reason why i'm only going to run 10psi. It's plenty anyways to have fun. Should produce 265whp on a T25/VE engine with pretty much instant spool. Great to just run it up to 5000 rpm's on the street because it will produce great torque.