2004 Jaguar Xj8 Base Sedan 4-door 4.2l 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 XKR-S GT takes fiercest feline further [UPDATE]

If there were any car to overshadow the 542-horsepower Jaguar XJR that's coming to the New York Auto Show, this is it. Meet the Jaguar XKR-S GT - a street-legal, higher-performance version of the already hardcore XKR-S that will be headed to North America in very limited quantities. Only 30 will be offered on our continent, with 25 earmarked for the United States and the remaining five going to Canada. The cost of entry? $174,000 when it goes on sale this August.
What that gets you is a coupe that is, without any doubt, ready to attack any racetrack it might encounter. The XKR-S' supercharged 5.0-liter V8 has not been upgraded in terms of power - not that 550 horsepower and 502 pound-feet of torque is anything to sneeze at - but instead, Jaguar focused on tuning the bits of the car that help effectively put all that grunt to the ground. There's a new hood with rows of louvers to aid in engine cooling, and elsewhere on the car's body, you'll find carbon fiber on the redesigned front air splitter, dive planes, extended wheel arch spats, as well as a new rear diffuser, an aluminum front under tray and an absolutely massive wing out back to keep downforce to a maximum.
Underneath that hot body are retuned and height-adjustable adaptive dampers; spring rates have been increased by 68 percent in front and 25 percent at the rear versus a standard XKR-S. Most of the front and rear suspension geometry has been upgraded, larger carbon ceramic brakes have been fitted at all four corners, and wider 20-inch forged alloy wheels are found here, wrapped in Pirelli Corsa tires - 255/35-series rubber in front and 305/30-series stuff out back. There's also a revised active exhaust system, which should only improve the already thunderous roar coming out the back of the Jag coupe, and a faster steering rack has been added for improved agility.

2013 Jaguar XF Sportbrake

Editor's Note: Our reporter was anxious to get some time behind the wheel of the XF Sportbrake, even though Jaguar only had a very small window available for us to drive it. As a result, we weren't able to capture our usual original images to go with the Quick Spin story. Please accept our regrets, and Jag's lovely stock photography, instead.
The last wagon attempt from Jaguar was the X-Type, built between 2003 and that model line's unceremonious end in 2009. That X-Type and its legacy represent a real dog of a chapter for Jaguar, and for the Halewood factory where the barker was built. It was the final joke told prior to the brand's proper rebirth phase - a phase we're enjoying the heck out of today.
Current magnanimous Jaguar owner Tata can be thanked for this new wagon, the XF Sportbrake. Like all newness coming from Jag these days, this new wagon also feels lightyears more serious an offering, ready to compete squarely with established premium wagon makers across Europe. A Jaguar wagon in America is a far-off priority for the company, frankly. Still we deserve to know what we're missing for the time being from this (sometimes overly) cherished British firm.