2005 Jaguar X-type Premium Sedan 4-door 3.0l on 2040-cars

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This classic Jaguar XJ has a 720-hp ungentlemanly secret

Forget Tawny Kitaen. If you want to make a Jaguar XJ rock, just do what this guy did: stuff a heavily modified and turbocharged General Motors V8 under the hood, and take it to the track.
The video calls this Series 1 XJ a sleeper, but with its open exhaust and obvious turbo whistle, the once-gentlemanly sedan is anything but. The owner says that the engine is GM LQ9 V8 that has been stroked to 402 cubic inches putting out around 720 horsepower with 12 pounds of boost (in standard form, this 6.0-liter V8 was used in the second-gen Cadillac Escalade). Check out the video below to see what that kind of power does for this classic Jaguar in the eighth-mile.

2014 Jaguar XJR

Jaguar In Its Purest Form
Jaguar has spent a lot of time, money and engineering effort refocusing itself for the modern world. In 2006, the current XK replaced the former XK8 and introduced a new aluminum-intensive chassis architecture to Jaguar's portfolio, and two years later, the XF whipped up a similar overhaul to its classical styling department.
The next major revision came in 2009, with the introduction of the achingly attractive and completely new XJ sedan, and this step struck us as the biggest improvement yet; not only was Jaguar's flagship built atop a cutting-edge platform, it boasted a newfound sense of style that pointed toward the future while still echoing the brand's storied past. This trend has continued most recently with the two-door F-Type that we've already grown quite fond of.

Is Jaguar's 3 Series-fighter the brand's last chance?

The upcoming line of compact 3 Series-fighters from Jaguar, often referred to as the Jaguar XS, could consist of a sedan, wagon and possibly a coupe and GT model (think BMW 5 Series GT). The car's all-aluminum architecture also will provide the basis for two new sports utility vehicles. Just how important is the much-touted "baby Jag" project to parent company Jaguar Land Rover? A JLR executive reportedly says the brand's survival is directly linked to the success of the XS, codenamed X760, Autocar reports.
The brand's survival is directly linked to the success of the XS.
"If the X760 fails, it will probably be the end for the [Jaguar] brand," the executive says. But Adrian Hallmark, Jaguar's global brand director, claims Jaguar will "build the most advanced, most efficient, most refined car in that [compact luxury sedan] segment. Not almost as good as, but better than the best in the world."