The "R Model" version of the Mustang will be a purpose-built track car based on the same 4.6-liter V8 that powers every Ford Shelby GT; the vehicles cannot be registered for the street.

A six-year hiatus followed before the GT500 was reincarnated as a new-generation S550, now with 760 hp and an all-new body and powertrain. This Ford Mustang Shelby GT500 sold for three model years ...