This is why I use the March box. I have a short section of 3.5" pipe between the MAF and throttle body and then the filter on the end of the MAF in the March box. The stock fender opening (where air comes through) on a Fox is actually larger than the opening in the bottom of the air box on a '11-'14 Mustang (I've measured the opening in my wife's '12 V6 Mustang. The 3.7 and 5.0 cars share the same lower air box and ducting).Any cold air system that does not place a 90 degree bend on the inlet of the MAF is better than one that does. I like systems that use the air box to make the turn into the fender. This is less restrictive than making the turn with a small pipe. This isn't even mentioning the havoc a bend on the inlet of of a MAF causes to the signal.
Remember that having longer pipe with more bends is VERY restrictive.
You lose more than you gain from the "cold air" or the "ram air" by having a complicated tube that is long and turns and bends into the fender well.
I've kind of figured that the scoop and hose would actually be more of a restriction than just pulling air from the fender opening. I think the only way it would make sense is if it somehow pressurized incoming air, which unfortunately it does not accomplish.