I hate to say this in such a blunt manner, but that's a really, really poor idea if you are trying to do anything beyond simply be "that guy with the twin MAF'ed Mustang". The airflow needs of the motor surely don't require it, it would be expensive and probably would require expert tech on the electronics end.
It sounds kind of cool, but why on earth would you even contemplate it?
EDIT-
perhaps you are thinking of some kind of ram air setup? In any event, it would make MUCH more sense to try to relocate the MAF to just-before the TB, and then plumbing your dual airsources to the common line just prior to the intake. Still not much performance gain, I expect, but it would be easier to do by about 1000 miles.