Welcome
There is a list a mile long (I have done bonnet, wheels, springs etc) but I very much doubt any of these will boost resale (simply, they won't )
Whilst these are great fun/value cars, at the end of the day they are nothing special and new models will come out each year with better features.
Enjoy it for what it is, a depreciating toy 😃. A bit different for the 2015 GT350 which was limited in numbers etc, but they are a world away from the current high $ Shelby bolt on plastics
My 2c
Cheers
Greg