Originally Posted by RCZ

Some of you guys are pretty clueless...just because its not hitting 8psi of boost, it doesnt mean he isnt flowing the same amount of air he would be at 8psi. Yes its more free flowing, thats why the boost doesnt build up. The problem is that he CAN'T just keep adding boost because that will add air volume. The real engine killer is flow, not psi. So for those of you who say "oh we can just add a 12psi pulley and it will even out" that is not the case. The motor wont last.

You are better off running 371whp at 5.5psi if that is what the car wants to do. I wouldn't push the stock block too far over 450whp on a dynojet on a car that will not be running race gas regularly.
371 on a mustang dyno is about 415-420 on a Dynojet, I guarantee thats what you're going to find. ( on a side note, stop rushing to find a dynojet because you think these numbers suck) The dynojet isnt going to make your car go faster or flow better. I know you want to see higher numbers..

FWIW...my advice would be to leave it as is and enjoy your car where its. Its safe, its making good power. Don't go risk something and waste more money just because you want to make people happy.