i paid $31K for mine in 2016, mostly for the 3.6 in in (thanks to matt monson for the tip!). i always liked the GT's, never reckoned i'd own one. not kicking myself.
when i bought it:
a few dollars and some time, and viola.
mine is a converted 4, and certainly wouldn't bring that kind of money. these cars with proper power are a lot of fun...