cutout =less boost

[GasGuzzler]

Boost pressure is a measure of restriction in some ways.

[AKlowriderZ71]

I'm gonna try to explain this one more time. Any mod that increases the efficiency of your engine(heads, cam w/more lift/duration, headers, cutouts, CAI, etc.) will increase hp. It doesn't matter if you are n/a or FI. That basic principle still applies.

You asked if adding a cutout will add hp to your setup. Since you have a flowmaster, I'll guess that it will add hp. Only a dyno will tell how much, every truck setup tests differently.

You asked if it will change your boost level. If it does infact flow better thru cutouts than the flowmaster, then the boost pressure being measured in your intake manifold will drop. But you are still making more power due to the increased efficiency of the new setup. Remember, the Magnacharger is still spinning the same speeds as before, thus still moving the same amount of air, just with less restriction in the exhaust, so it's easier work for it.

Now you say you want to get back to the 8 psi boost that you had before the cutouts. To do that, you need your Magnacharger to move more air(volume). To do this, you replace the pulley with a smaller diameter pulley. The typical steps are 1 psi increase per 0.1 inch smaller pulley. So, if you lost 2 psi after installing cutouts, go from your 3.3 to a 3.1 pulley, and you're back to 8 psi. Oh, and when you went from 6, back to 8 psi, you made even another gain in hp.

Better?