but you do have to admit that this is aggressively attacking it, and you are prone to have more problems. I'd rather be safe and more conservative, but that's me. :-) I do believe you can run 12 psi with no problems...MAYBE 13. If you add some race gas, maybe 14-15. After that, I'd be using an AFC at least. There's also another thing to point out. With the Z injectors being prone to failure, you could have one out of spec and not know it. How would you like to be running all that boost if that's happening? :-(