The testing regime for the Jaguar XF-R is ongoing, and we have the latest photos of the same silver prototype previously caught wandering the American southwest.

The testing regime for the Jaguar XF-R is ongoing and we have the latest photos of the same silver prototype previously caught wandering the American southwest.

Powered by a supercharged 5.0-liter V8 producing 500+ hp and riding on unique 20-inch alloy wheels, Jaguar isn't doing too much to hide the air vents on the hood, large bumper air intakes, a discreet boot spoiler and quad exhaust.

After a no-show at BIMS, we're expecting an official debut early next year in Detroit. However, Los Angeles auto show next month could be an appropriate venue to makes its debut.

Gallery: Same Jaguar XF-R Spied Again in Death Valley