Originally Posted by Elvis Presley
I've been trying to preach this to people but they do not listen.
The thing with porting the TB is that without porting the intake manifold, you're not going to get the full benefits. There are benefits to extrusion removal process that could affect air flow and improve it somewhat but we're talking about 5hp at best.
You need to look at porting the TB as part of the overall intake process. IE, CAI, TB, Intake Manifold and combine that with improved tuning to account for the 'better air' into the engine. Of course you can also tag on exhaust manifold, cats and cat-back exhaust as other components to investigate.