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Watch this 650-hp Hennessey Jeep Grand Cherokee go from 0-60 in 3.9 seconds

Hennessey Performance Engineering has created an HPE650 package for the Jeep Grand Cherokee SRT fitted with the 6.4-liter Hemi engine. When it leaves the showroom floor it has 470 horsepower and gets from 0-60 miles per hour in 4.8 seconds. When it leaves Hennessey's garage floor after the upgrade it has 650 horsepower - 530 hp at the wheels, according to Hennessey - and gets to 60 mph in 3.9 seconds on its way to running the quarter-mile in 12.6 seconds.
There's more than just a Roots-type supercharger bolt-on, with ported cylinder heads and high-flow headers among the many changes made to the engine. You can watch this pre-2014 facelift silver model prove its spec sheet on the drag strip in the video below.

Weekly Recap: Jaguar takes a leap with price cut, new strategy

Jaguar was one of the famous automotive props and plotlines in the now-iconic drama Mad Men. There's a scene where the show's protagonist, Don Draper, deftly undercuts an influential Jaguar dealer by indicating that get-me-in-the-door local radio spots would be an effective way to sell cars like the slinky E-Type. The British executives think this is folly – Draper knows they will – and his advertising strategy wins out over the dealer's approach to move the metal. Jaguar's not doing that, but half a century later in the real world the company is launching plans to make its cars more attainable to new and younger customers like Millenials. These aren't coupons, but this is a leap for Jaguar, which has long banked on sexy styling and its rich motorsports history to overshadow its past mechanical flaws. Put simply, Jaguar is addressing the reasons why people, especially the younger set, don't buy its cars. The 2017 XE will start at $35,895 when it launches next spring – which makes it an attractive buy for a successful, relatively young person. When it's time to move up, the redesigned XF will be more attainable, coming in at $52,895, which is $5,275 less than the 2015 model. The flagship XJ sedan and the enthusiast-oriented F-Type sports car will also get thousands of dollars worth of added standard features, and Jag is actively pitching them as a better value than their competitors. "The Jaguar brand is on the eve of a major transformation that will see it dramatically increase its presence in the United States luxury marketplace with an expanded lineup, pricing focused on the core of the luxury market, and an all-new ownership package with best-in-class coverage," Joe Eberhardt, CEO of Jaguar Land Rover North America, said in a statement. The brand's quality and reliability dings have also lurked in the back of buyers' minds for decades, though that's an outdated notion. Jaguar placed third in J.D. Power's Initial Quality Study in June and was the top-ranked luxury brand in J.D. Power's Customer Service Index in March. Not content, the company is rolling out an enhanced program called Jaguar EliteCare that launches on 2016 models. It offers a five-year, 60,000-mile limited warranty, the longest among its competitors, with free scheduled maintenance during that period. The plan also covers roadside assistance and connectivity features.

Jay Leno rides high in Fab Fours Legend

Jeep showcased some pretty awesome concepts at its Easter Safari in Moab a few days ago, but few if any of them were quite as extreme as what's rolled in to Jay Leno's Garage for this latest video installment. It's called the Legend, and it was made by aftermarket bumper manufacturer Fab Fours to demonstrate its capabilities. It's obviously based on the Jeep Wrangler, but it's riding high on 50-inch tires with a jacked-up monster truck suspension, giant fenders, a chopped-down red-tinted greenhouse and something its creators call a "grumper" that integrates the bumper into the grille. Or vice versa. Though most of the oily bits have carried over from the production model, it's hardly what you'd call "practical," but it's sure to turn a lot of heads... even one as massive as Jay's. Related Video: