there is no real way to know really. Is the timming staying the same? a loss in boost doesn't have to mean a loss in power. there are some many little things to consider. when i did the cam swap from ls6 cam to my current cam i lost a few pounds of boost in high boost mode but ran about .6-.7 faster in the quarter. not to mention i went back to awd with the cam swap. no traction issues at all with 2wd and the ls6 cam, i just got tired of the axle breaking. now with it turned back up to the 13ish psi that it had before its much much stronger.

 

my 6.0l made 30rwhp per pound, but like everybody said each setup is different.