Hey Little Buddy....
welcome to spamtown.. its quite now but things will pick up soon or later...
dude how can that make any sense? what i can say is that it is prolly 7psi... as that is what happend in my gsr lance and in my sil all ran 7psi stock same with my friends r33 gtst
dont know about gtrs though....
oh and stock rexs run just under a bar 13.7 psi...
sorry mark that i cant be of more help...