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Jay Leno hits the road in a 1951 Jaguar XK 120 Hot Rod

The 1951 Jaguar XK120 featured in this episode of Jay Leno's Garage might look vaguely like a classic Jag roadster at first, but underneath this cat is something completely different. It was built by Leno's buddy Jason Len of XK's Unlimited when he grew tired of keeping these convertibles stock, and this aluminum-bodied beast was the result. Practically the only major Jaguar part left is the engine. It's a tuned 3.8-liter inline six from an E-Type with Weber carbs that makes an estimated 300 horsepower out of some gorgeous side-exit exhausts. The mill is backed up to a BorgWarner five-speed manual. However, the big surprise is the chassis. In place of Jag's original solution, Len has a custom tubular space frame that he claims sheds some 1,000 pounds over the stock example. There are still some classic Jaguar touches left, though, such as the fin over the driver's head that is reminiscent of the D-Type, and both the wheels and gauges are replicas based on that classic racer. Of course the best part is watching Jay drive this Jag hot rod. This big cat really knows how to purr.

Jaguar vs. Jetman: Place your bets

As many car-versus-jet races as we've seen on video, we never seem to tire of them. This latest one, however, doesn't so much pit a car against a jet airplane, per se, but a guy in a jetpack against a supercharged Jaguar. That in and of itself might make this clip worth a watch. The guy in question is one Yves Rossy, otherwise known as the Jetman. The Swiss air force aviator developed, wears, and pilots a six-and-a-half-foot-wide fixed wing fashioned from carbon fiber and fitted with four jet turbines strapped to its underside, each good for 88 pounds of thrust. He's flown it over the Alps, across the English Channel, and above the Grand Canyon, but now he faces off against another adversary. That, of course, would be the Jaguar XJR, complete with 5.0-liter supercharged V8 good for 550 horsepower. Piloting the performance sedan is none other than Martin Brundle, a former F1 driver, Le Mans winner, and television commentator. The two line up on and above a 1.75-mile stretch of road in the deserts of Dubai for the showdown. We could tell you who won, but you'll want to watch the video above for yourself to find out first-hand. And if you want to know more about the Jetman and his amazing flying creation, watch the video below. Related Video: F1 Star Martin Brundle and New Jaguar XJR Take on High-Flying 'Jetman' in World-First Desert Drag Race - Martin Brundle drives new 2016 model year Jaguar XJR in 1.75-mile live car race against 'Jetman' Yves Rossy in the Dubai desert - Head-to-head race demonstrates the benefits of lightweight construction on agility, performance and control in the air and on the road - Sandy conditions offer a clear demonstration of the benefits of the Jaguar XJ's new All-Surface Progress Control (ASPC) - New short film captures the action: https://www.youtube.com/watch?v=xssOxHoEhrk - Brundle and Rossy discuss comparable technology within their two machines The Jetman Dubai pilot Yves Rossy, took on his first ever live race when he went head-to-head against a Jaguar XJR driven by former Formula One star Martin Brundle in a unique contest deep in the Dubai desert. Brundle, who drove in F1 alongside Michael Schumacher and is now a commentator, had the new all-aluminium 550PS, 5.0-litre Supercharged V8 Jaguar XJR at his disposal while Rossy was strapped to his 2m-wide fixed wing, powered by four Jet-Cat superchargers. The race took place on a closed private road and in the skies above it, and was captured in a three-minute short film.

Jaguar Activity Key | 2017 Autoblog Technology of the Year Finalist

In principle, the Jaguar Activity Key is a good idea. It's simple, useful, and relatively inexpensive. Unfortunately, in our testing it was less than reliable. Here's how it's supposed to work: To lock the car, leave your keys and fobs inside the vehicle, and strap the band on your wrist. Then, within 30 seconds, place your banded wrist against the letter J of the Jaguar script on the back tailgate. When you come back, you can unlock the vehicle by pressing the tailgate opening button, then, again within 30 seconds, placing the Activity Key band against the J of the Jaguar script. We chose the Jaguar Activity Key as a finalist for our 2017 Tech of the Year award because it's an uncomplicated device with lots of potential customers. Jaguar says the wristband is "robust and fully waterproof." Swimmers, surfers, kayakers, hikers, and even couples out for a sunny-day picnic could use a feature like this wristband key. Plus, wearables are pretty new as a category in general, and even more so in the automotive space. We didn't go skydiving with it or anything (an activity Jaguar cites as a potential usage case), but we did dunk it in water with no ill effects. While it all sounds good in theory, actually getting the Activity Key to work effectively was unexpectedly difficult, especially when the cameras were rolling. We tried varying the timing between closing the door and using the wristband, as well as between using the tailgate button and the wristband. It worked about half the time, regardless of our process or who was wearing the wristband. Whether our issues with the wristband were due to interference, new-technology teething problems, or just electrical gremlins, the idea of purposely locking the keys inside an automobile without having a foolproof way to unlock it gives us reason to pause. The Activity Key is a $400 standalone option on the 2017 Jaguar F-Pace, but only on Prestige, R-Sport and S models. The least expensive F-Pace with Activity Key costs $51,095.