My Father got a 2014 CS 5.0
Just make sure if you buy a used tuner it is unlocked/unmarried to the previous car. Otherwise your looking at fees from the company to unlock it. If it's unlocked you are then looking at tune fees. Most of the time the purchase of a used tuner plus tune fees will be the same or close to a new one which will include tunes or even tunes for life with bama.
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2007 Mustang GT/CS Convertible - AT - Redfire
Bama 91R-V2 Tune - Roush CAI - FRPP GTA Axlebacks - 3.31 Gears