1955 Jaguar Xk-140 Roadster Covertible, White Exterior, Red Interior, Tan Top 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.

Hardcore Jaguar F-Type underway, 600 horsepower possible

Thanks to an already potent range of supercharged engines with some of the best exhaust notes available, the Jaguar F-Type is without a doubt a sublime performer. Still, there's always room to grow, and we are getting another good look from the Nurburgring at what's suspected to be an even more powerful version on the way. Spy shots of what was believed to be the Jaguar F-Type R-S first came out last spring. This time the roadster is practically uncamouflaged, though. The similarities are definitely there, and both test cars wear the same wheel design and quad-tailpipe rear diffuser. The latest one lacks the massive front splitter jutting out but gets a quite large, fixed trunk lid spoiler at the rear. You can also spot some large-diameter ceramic brake discs behind the wheels. The things happening under the bonnet might be even more interesting, though. To befit all of the exterior performance upgrades, Jaguar's supercharged 5.0-liter V8 is expected to nestle between the front wheels, and the mill is likely getting a boost in power to take output to 580 or even 600 horsepower, versus 550hp in standard form. Hopefully, the extra grunt makes the exhaust note even more intoxicating, as well. Featured Gallery Jaguar F-Type R-S Spy Shots Image Credit: CarPix Design/Style Spy Photos Jaguar Convertible Performance jaguar f-type r jaguar f-type r-s

The best Super Bowl car commercials from the last 5 years

If you've been dipping into the Autoblog feed over the past days and weeks, you wouldn't even have to be a sports fan to know the Super Bowl is coming up. Automakers have been teasing their spots for the big game, dropping them days early, fully-formed onto the Internet and otherwise trying to amp up the multi-million-dollar outlays that they've made for air time on the biggest advertising day of the year. And, we're into it. The lead up to the Super Bowl is almost akin to a mini auto show around these parts; with automakers being amongst the most prolific advertisers on these special Sundays. The crop of ads from 2015 looks as strong as ever, but we thought we'd take a quick look back at some of our favorite spots from the last five years. Take a look at our picks – created from a very informal polling of Autoblog editors and presented in no particular order – and then tell us about your recent faves, in Comments. Chrysler, Imported From Detroit Chrysler, Eminem and a lingering pan shot of "The Fist" – it doesn't get much more Motown than 2011's Imported From Detroit. With the weight of our staffers hailing from in and around The D, it's no wonder that our memories still favor this epic Super Bowl commercial (even though the car it was shilling was crap). Imported really set the tone for later Chrysler ads, too, repeated the formula: celebrity endorsement + dramatic copy + dash of jingoism = pulled car-guy heartstrings. Mercedes-Benz, Soul teaser with Kate Upton One of our favorite Super Bowl commercials (and yours, based on the insane number of views you logged) didn't even technically air during the game. Mercedes-Benz teased its eventual spot Soul with 90-seconds worth of Kate Upton threatening to do her best Joy Harmon impression. (Teaser indeed.) It doesn't win points for cleverness, use of music, acting, or any compelling carness, but it proved that Mercedes' advertisers knew how to make a splash in the Internet Age. And, hey, it's still classier than every GoDaddy commercial. Kia, A Dream Car. For Real Life Like the Mercedes video above, the initial draw here is a pretty lady; in this case the always stunning Adriana Lima. But this Kia commercial really delivers the extra effort we expect while scarfing crabby snacks and homemades, too. First of all, Motley Crue. Second, a cowboy on a bucking rhino. Enjoy yet again.