When is a Jaguar XFR not a Jaguar XFR? When it's an XFR-S, that's when. So while this vehicle may look like your standard supercharged Jaguar sedan, it's actually a British rocket aimed – in a bit of role reversal – squarely at Germany.

Spied undergoing development work at Jaguar's test center near the Nürburgring, this test mule looks pretty much like the XFR you can already get from your local Jag dealer. But our sources on the ground tell us it sounds more like the XKR-S, the 550-horsepower super-coupe seen running alongside it.

Though the prototype pictured lacks the exterior visual cues that would go along with the anticipated engine swap, the telltale exhaust bellow tells us the likes of the BMW M5 and Mercedes-Benz E63 AMG had better take notice.

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