Just to let you guys and the rest that are considering EFI builds know.....
When you go to nicely ported heads like Baisley and keep the stock TB, you are definitely holding back the flow. MAP almost always will start to drop from anywhere from 4100 to 4700 on a decent 95 and higher build with the Delphi. BUT.... the difference in HP is maybe 3 to 4 HP with a cam like the 37. And some of that may be caused by front to rear fuel reversion at high R's. So not a big deal on the TB size. Remember that you aren't hanging around in the 4000 to 5000 rpm range for very long anyway. The most that you can bore out of the stock Delphi is about 3mm MAX, and although that will move your MAP drop up a few hundred R's, it doesn't completely solve the issue you are having. Again, I'm not calling it a problem because it really isn't on a cam like the 37. This is for up to 2005 models. The 06's have their own problems in this arena, but some of those are influenced more by the smaller injector size that simply will not support high HP engines because of the limited pulse width. This, COMBINED with the TB bore, WILL cause problems on 06's that are trying to make big power.
Anyway, don't everyone go crazy buying big TB's, because in most cases you will never feel the difference. Really a nice alternative is to send them out to a guy like Dakota Kid who will not only increase the bore but also increase intake velocity due to his re-work. And that, my friends, is the real key!
As for the quote from Daytona Twintec on the inadequecy of the stock TB, while Chris Schroeder is a pretty sharp guy, his numbers on the limitations of the Delphi show that it is inadequate to maintain MAP gain. But it really does not affect streetability of most 95" builds. And his limitation on the HP number is really not a limitation at all. (BTW, you can get more that 105). MOST 95" street builds are not making too much more than 105 HP anyway. And TQ is always on the way down by the time that MAP drop occurs anyway. So what are you losing???? Not much.
Take that quote with a grain of salt!
FYI
All the best
G