Yeah the rear deck is okay on the Mustang. It's the only spot that is as far as aero. So I wouldn't mess with it. The front could use a grill block but you'll have to watch the temps and play it by ear on how much to cover the grill. The underbelly pan will probably do the most for you on stock ride height. I seem to recall that the '05+ Mustang generates a lot of lift so you might have to watch that. I dunno.
Read everything that you can before you start. Preparation is most of the work.
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-Allch Chcar
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