Currently, regular Treasure Hunts are no different than the normal versions of a car with the exception of a small circle flame logo somewhere on the car. A Super Treasure Hunts have Spectraflame paint and Real Riders wheels.
The Super Treasure Hunt Toyota 2000 GT doesn't have a circle flame logo, but it does have "TH" on the right rear corner of the hatch. Not sure if a "TH" is in place of the circle flame logo on all Super Treasure Hunts as I've only found the one so far.
And every time I'm in Wal-Mart, I check the Hot Wheels to see if any new stock has come in. I usually check the Wal-Mart of the town over too when I'm there on Wed. for comics. Still looking for an Enterprise. I've got I think at least 2 extra regular 2000 GTs.