Interesting, I saw this on another site today which was spotted in Florida.
Kind of weird they're testing cars at a drag strip in Florida.
It's pretty clear that the car with the wing is the R. That other car is interesting though, it looks like a normal GT with a wing. There were rumors of a Mach 1 that came out with the GT350 rumor. But to be honest this could be a test mule for anything. That could have anything from a regular Ecoboost to some new engine we've never heard of or even be just an early GT350 mule.
No matter what it is, I'm curious and want to find out more! And in case no one noticed, there's a 2012 Laguna Seca behind the R.