I have been running 22 psi for about two years and not had any problems - that being said though i don't even give it full throttle.

I have a steel bottom end, "stage 3" head - larger valves and a standard cam. bigger inter-cooler and just fitted but not tested an aqua mist kit.

It is still a mfi head, and i havent changed the injectors but i am all ears for suggestions ...

As for the straight cut box - i think i am sold it sounds like it will be a good investment.

Do you know what brand of box he had?