He's in South Carolina, its not going to be as slow to sell a car like that in January as it is in places up north.
Definitely sell it unless the dealer is giving you some sort of deal on the 2016 that is too good to pass up.
And yes, remove your CAI and sell it. You can keep your tuner and get a new set of tunes burnt for the 2016. Would recommend against another CAI for the 2016, they don't do anything (neither does the one on your V6).
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.