A new spy video catches a pair of Ford Mustang Shelby GT500 test mules ... you might think these folks are stalking wild animals. The Grabber Lime green GT500 has a bigger, more aggressive wing ...

A tuned-up EcoBoost Ford Mustang RTR model will soon be burning ... the RTR from standard EcoBoost Mustangs, such as lime-green-painted Brembo brake calipers, 19-inch wheels, and a rear spoiler.