Basically this process smooths out the burrs and rough spots in your manifold and heads to allow a smoother flow through the system like polishing. This has been going on for many years with the race car/hot rod scene. It should not matter weather your S/C'd or not.
$1725 for heads, exhaust manifold and intake manifold....ouch!
A bit cheaper for a group buy! That is exspensive horsepower.
You can do the same thing at home with a dremel tool!