Our UPR/SCT tuner makes a big difference on a 3V! If you haven't already ordered your tuner, check ours out. Free tunes for life from UPR Products!

http://www.uprproducts.com/mustang-s...or-xcal-3.html

I've read the stock airbox airflow on the 2010+ models are more efficient, therefore there is not a noticeable difference when you replace with a CAI. You could focus on getting the handheld tuner/custom tune. You will feel a noticeble performance difference once you upload the custom tune!