felonious shitake

I've done searches but have not found a direct answer to my question. How do the throttle bodies of the 944,951,S,S2 compare. Would any of these be swappable to lower horsepower car, as an upgrade? I.E. turbo to 8v N/A, or S2 to S?
Cheers <img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />

Luke

I know the TB in my 951 is alot smaller than my freind's S2.