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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.

Watch the 2018 Jeep Grand Cherokee Hellcat blast off

It's all but official. Jeep will produce a Hellcat version of the Grand Cherokee with crazy horsepower. We mean crazy. Today, our spy shooters have captured video footage of this demonic creation. It's pretty short, but you can see a dark Grand Cherokee launch with vigor and then brake hard to a halt. We think we detect the whine of a supercharger amid the commotion. Jeep boss Mike Manley has said on video that the JGC Hellcat will arrive before the end of next year. Specs aren't known, but it seems likely that the Jeep Hellcat will share the blown 6.2-liter V8 used in the Charger and Challenger Hellcats. We've also heard rumors the Trackhawk name could be used for this vehicle. In those applications, the beastly Hemi pumps out 707 manic horsepower. Really, why wouldn't you do this? Jeep sales surged 22 percent around the world last year to 1.2 million, the brand's best year ever. Clearly, Jeep decided it was time to add an extreme performance vehicle. Jeep already sells an SRT model that pumps out 475 hp, so adding a top-end Hellcat seems logical. And a Hell of a lot of fun. Related Video:

Weekly Recap: Ferrari looks to reclaim old success with new manager

Clearly, Ferrari doesn't race for fourth place, and this week, major changes continued at the Scuderia. It was a rough year for Ferrari, and the Scuderia conducted its season-ending tests in Abu Dhabi this week with a view toward a fresh start in 2015 with new leaders and a new ace driver. Though plenty of other Formula One teams were disappointed with their finishes in 2014, Ferrari was perhaps the most eager to put this season in its rear-view mirror. The Scuderia finished a distant fourth in the Constructors standings with 216 points, well behind No. 1 Mercedes (701 points), and Ferrari failed to win a single race as the Silver Arrows dominated the grid. It was an especially bitter pill for a team that claims 16 Constructors championships and 15 Drivers titles – the most in history – and is the only surviving team from F1's first season, 1950. Clearly, Ferrari doesn't race for fourth place, and this week, major changes continued at the Scuderia. Ferrari named Philip Morris executive Maurizio Arrivabene as team principal. He replaced Marco Mattiacci, who held the job for only seven months after taking over for Stefano Domenicali, who resigned in April amid the Scuderia's early-season struggles. Phillip Morris (through its Marlboro brand) is a key Ferrari sponsor, and that played a role in Arrivabene's ascension. Still, he's no stranger to F1, and has been intimately involved in the Ferrari-Marlboro partnership. He also has served as the sponsors' representative on the FIA's F1 Commission since 2010. In a statement, new Ferrari chairman Sergio Marchionne said: "We decided to appoint Maurizio Arrivabene because, at this historic moment in time for the Scuderia and for Formula One, we need a person with a thorough understanding not just of Ferrari, but also of the governance mechanisms and requirements of the sport." Arrivabene's background is primarily in marketing and communication, and most recently he held the title of vice president of consumer channel strategy and event marketing for Philip Morris. He has been with the company since 1997. Arrivabene now leads a team that's rife with change. Marchionne took over in October when longtime boss Luca di Montezemolo quit in a disagreement about Ferrari's future, and the company itself will be spun off from parent Fiat Chrysler Automobiles in 2015.