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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.

Why the 2018 Jeep Grand Cherokee Trackhawk really exists

"But really, what do we do for Jeep? We listen to our customers, that's our job. We give them what they want. So the reason why is, they ask. Lots of them asked." – Darryl Smith "Why not?" It's a simple-enough explanation and one that should resonate with any car lover who views the absurd and the gloriously pointless as fundamental principles of their passion. And putting a ridiculously powerful engine into a vehicle that would normally not have one is perhaps the pinnacle of that. It's the reason that so many of us view a Mercedes-AMG E63 wagon as far cooler than an SLS AMG with roughly the same engine. With that in mind that we sat down with two of the men responsible for the 2018 Jeep Grand Cherokee Trackhawk, the latest entry into the absurd and gloriously pointless segment. We wanted to find out from Darryl Smith, director for SRT engineering, and Paul Mackiewicz, vehicle development manager, if there were actual market-based reasons for the Trackhawk's creation. Effectively, why'd they actually do it? "Why not?" Smith immediately offered during an interview at the New York Auto Show, clearly possessing a similar mindset. "But really, what do we do for Jeep? We listen to our customers, that's our job. We give them what they want. So the reason why is, they ask. Lots of them asked." View 24 Photos If "lots" of people are asking for a 707-horsepower, 645-pound-feet, off-road-capable, luxury-lined, five-person SUV, then perhaps we shouldn't be too worried about the demise of the human-driven automobile after all. "There is a very defined customer base out there that want a sport SUV," Mackiewicz said. "They want a sports car with the capabilities of having an SUV, of being able to tow, of being able to drive their sports car all year round. And that's what this car enables. It is ultimate performance, all year round, in any condition." If BMW, Mercedes-Benz, Porsche, and even Maserati can produce high-performance SUVs, doesn't it seem fitting that the father of all SUV brands should top them all under the hood? Of course, expanding the 6.2-liter Hellcat engine beyond the Challenger and Charger is clearly a smart business case in the current SUV-obsessed marketplace. FCA had a lust-worthy engine, and it had a solid performance base in the existing Grand Cherokee SRT, so it can be argued that marrying the two made sense and that it could be done with minimal fuss — even if in practical terms, it's absurd.

Mopar teases four of 'nearly 20' SEMA Show concepts

Yesterday it was Chevrolet. Today, Mopar has dropped some SEMA knowledge, releasing a quartet of teaser images that give us some indication of what kind of cars, trucks, and crossovers Fiat, Chrysler, Dodge, Jeep, and Ram will be showing in Las Vegas. Like Chevy, Mopar's concepts utilize both production and concept accessories, although Fiat Chrysler has gone a bit more indepth on at least one of its concepts. Immediately, the most tantalizing teaser is the one shown above. Yes, that's the back of a Challenger, and aside from the bright orange accents on the gray body, you should take notice of the badge mounted on the spoiler – yes, that says "GT AWD." To be honest, such a vehicle wouldn't be a huge shock, as both the Challenger's LX platform-mates, the Dodge Charger and Chrysler 300, are offered with all-wheel-drive options. Still, adding such a vehicle to the production cycle would give Dodge a leg up on the rear-drive only Ford Mustang and Chevrolet Camaro. Aside from that concept, FCA has also released teasers of a Ram-based concept, a 300-based concept, and what we're guessing is a Fiat 500X. We can't wait to see what the actual Fiat concept has to do with kiteboarding. As for the 300 and Ram, there's not a lot of hints on what sort of styling details they'll contain. The Chrysler has additional LED accents and what we're guessing is matte blue paint, while the Ram is based on a Hemi-powered 1500 with Rebel styling cues. This is just a very tiny sample of Mopar's final SEMA roster, which include "hundreds" of parts. There should also be a total of 20 vehicles covering all four former Chrysler Group brands, as well as Fiat. Naturally, we'll have plenty to report on each vehicle once the SEMA show kicks off in the next couple weeks.