New rumors have surfaced indicating FoMoCo is working on not one, but two special performance Mustangs. 

MustangNews claims that Ford is working on a new Mustang Mach 1 and the new Shelby GT500 concurrently. It's believed that several of the recent Mustang testers spotted were in fact Mach 1 mules and not the GT500.

It's thought the Mach 1 will make use of an enhanced 5.0L V8--much like the transformation from Coyote to Road Runner for the 2012 Boss 302. The Mach 1 Mustang would be Ford's answer to Chevrolet's Camaro 1LE, complete with tighter suspension, stickier rubbers and throatier sounds.

As for the GT500, it's believed we'll see a twin-turbo V8 of some kind, either the Coyote 5.0 or the Voodoo 5.2--with or without a flat plane crank-however Ford has yet to acknowledge either project.

The existence of two cars would certainly explain the lack of forced induction sounds from the most recent round of spy videos . While the other  mule has been caught wearing TT designated stickers , which is believed to be an internal code for EcoBoost programs.

The TT designated car seems to have bulkier camo up front along with a large pedestal style wing out back, which could indicate a more thorough rework of its mouth than the Mach 1 mule.

It's rumored we could see one of the cars at the LA Auto Show this coming November and the second in Detroit come January. We'll bring you more details as we get them.