ive been told my tons of people to not mess around with the TB on the S197's unless you plan on doing some serious mods. The stock one does just fine by itself. Do you have any other mods planned???
Yea dont mess with it if your N/A, Unless your stroked and built SEXY... The 750 cfms of the stocker will more then suffice!
If you are boosted on the other hand... unless you are over 11-12psi you still would not benefit from it...