Originally Posted by Caravanshaka

he's not making MORE power with Less boost thought. He is making more power at the same level of boost than he would with stock exhaust though.

Basically. His efficient setup causes that pulley to only push 5.5 lbs of boost. If he replaced his exhaust with stock components, he would make 8 lbs of boost, and would make more power than his current setup. HOWEVER, if he gets his current setup up to 8 lbs of boost by way of a new pulley, he will make MORE power than the 8 lbs of boost did with stock exhaust.