I also laugh at the cold air intakes. The factory box has a better cold air flow from outside the engine compartment. I think many feel the open filter is so great......
Use a large enough tube so air flow is not restricted. I normally go a bit larger than the opening in the factory setup. If you do not seal off the filter from under the hood air, the air will flow from the easiest location. The grill end of the tube should have some kind of protective screening if low to the ground to help prevent to much debris pickup. You won't see a big increase in performance with full cold air on a street car. Where a person is trying to squeak ever single horsepower out, it will help.
Panama City, Fl.
I wake up in the morning with nothing to do and by supper time, I have half of it done.
2000 Lightning, s/c, tuned, Basanni, built tranny
Sold them all.....
Previous Mustangs:4 - '66 Coupes(silver/blue/grey/red) '87 GT HO, '00/'02/'07 GT Vert(red)(grey)(black), '68 Coupe, '11 GT/CS, 08 GT Vert