Or trade it for a more stock less modified car then off that one. I have a 2012 401a with some of the same mods as you (koni,steeda,barton etc etc) and would do a trade cash deal if you willing and close.
Maybe you could do some thing like that. Tons of guys here with little or no mods but lots of desire for the same mods you have done. With a trade, you could get some of your money out of the mods and have an easier time selling the more stock mustang for what its worth, assuming you wouldn't want to keep it.
Just an idea, maybe a shit one though because if I was still in the market I would be buying your ride over a new one.