friend of mine has a 99 7.3 i think it has banks 6gun for a chip and a banks big head waste gate. he gets 30psi maxs and would like more i know and my 00 cummins plugging off the waste gate will gain some, but is it possible with his 7.3???

 

No reason to look for more boost, I bet I have more HP at 15# boost then he does at 30... boost does not equal HP. The stock turbo is rated for 25# anything above that is more hot air your IC is trying to cool.