Actually those tires are good ones. The tread looks different, but thats how I can tell that they are BFGoodrich G-Force TA KDW (dry and wet traction, not snow) I have heard that they offer very good lateral grip.
They were not photoshopped on. The red and grey/white stripe show cars both have G-Force KDWs on their shelby-GT350-style 18" rims. Find a pic of the side of the NAIAS showcars, and you'll see "BF-Goodrich" and "G-Force TA" on the sidewalls.