He is correct, and that is why I run P&P heads on most of my customers cars. We can get the same power from a GTX motor on 8.5psi as compared to a bone stock GTX motor at 11-12psi.

 

Whats the most hp stock GTR injectors can hold? and also lets say i got the head ported with a GTR turbo whats the most
boost uve heard of going into the GTR motor? Before it blew. If it blew. And whats the most hp the GTR motor handled stock form ...Jon 93lx/GTR