As our First Drive suggests, the new Jaguar XF is the most fun you can have behind the wheel of a modern-day Jag, but that doesn't mean that Coventry is resting on its laurels. An XF-R prototype has been spotted undergoing testing and judging by the exterior mods alone, Jaguar has Germany's super sedans set in its sights.

The cloaked from fascia appears to get a set of larger air intakes on either side of the bumper, along with hood vents that hint at the beast that lies beneath. Car is speculating that Jag will use a direct-injected, supercharged 5.0-liter V8 to put out over 500 hp, while simultaneously keeping emissions in check. Other exterior changes include color-matched side sills (in favor of the chrome vents on the standard XF), a new 20-inch wheel design, quad tailpipes, a subtle rear spoiler and possibly a rear diffuser. Expect the Jaguar XF-R to make its debut sometime next year.

[Source: Car]