By 2021 if Ford badges the Mustang as the GT500 it will likely be quite a different animal than any GT500 that came before it. They will likely source the engine and driveline from their existing inventory and by then who knows what's in store for the car. The appeal of the GT500 comes with a big stout V8 with a PD blower and a beefy stick transmission that can be modded by anyone who can turn a wrench. I don't see Ford investing all that money into a car with a very low production volume in order to compete with Chrysler or GM who have large displacement engine platforms already in production. The Coyote engine design is just not stout enough to handle the HP needed to compete. If they attempt to augment the engine output with a hybrid setup will result in an overly complicated and heavy car. Ford should have hung in there with the mod motor just before the Trinity engine from a power and durability perspective has been on a downward side ever since. Hold onto you 2003-2012 SVT Mustangs you will never see a better platform from a hot rodder's perspective coming out of Dearborn again. If what I say is not true Ford would already have the GT500 in production. SVT has boxed themselves in a corner putting all their eggs in the Coyote basket. Right now the best place Ford can source a suitable engine is in a wrecking yard!