As for every little tweek, I have not a clue what the diffs are. Its nothing big but its nothing to looked over especially if your NA. You want every little pony!! I do and Im FI'd lol.
The temp of the TB is the difference for this mod. The air passes throught the TB right before it gos into the engine, air temp makes a diff. It won't not show on a dyno, meybe a 1hp is so and Fords not going to claim 215hp for the new 06. 07's Its just something that they found was not needed and the car benifits from it at the same time.
Its similar to an intercooler. U put a supercharger on it will make FI but a supercharger/turbo gets hot. In other words SC and TC's produce hot air. After the it produces the boost/hot air you put an intercooler in place before it makes its way to the throttle so its back to a good temp before it enters the engine. Thats why they say there is no point to going FI if you dont' have a intercooler.
Think about it... why would you want your throttle bodie heated?? Even if you are NA. Its going to heat the air before it enters the engine slightly. If you reduce the TB heat by obviously bypassing the it then the air is not at such a hot temp. The TB is heated just with the car running lol Remember I live in AZ, there is no point to it what so ever and obviously there is no point to it anywhere cause they bypassed on the 06, 07 too.
Check out Johns write up.........
A Hot Body
Top of the TB was about 160ish and the bottom was about 180ish. After the bypass the top was 93!! and the bottom 130ish!! Thas a good temp diff.
Procharger P1SC,3 Corecooler,42lb inj.
301whp & 300wtq @ 10psi dynojet SAE 106 degrees