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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.

Feds chastise Marchionne over Jeep recall, only 13% repaired so far

Following the significant outcry surrounding the General Motors and Takata airbag safety crises this year, the National Highway Traffic Safety Administration seems to be taking a much more aggressive role in pushing owners to repair their recalled vehicles. In the agency's latest move, it's urging Jeep drivers to get their models fixed. Acting NHTSA administrator David Friedman even sent a letter to Fiat Chrysler Automobiles CEO Sergio Marchionne pressing him to get more of the SUVs fixed. The problem goes back to the recall of the 2002-2007 Liberty and 1993-1998 Grand Cherokee because of the possibility for the fuel tank to rupture in some rear crashes. The campaign affected over 1.5 million vehicles, but Chrysler initially refused NHTSA's request for a repair campaign. The automaker eventually came up with a fix that involved adding a trailer hitch to provide extra protection to the tank. The feds believe the danger "will be reduced by the remedy now offered by Chrysler," according to the statement. However, this latest push comes out of NHTSA's concern that only three percent of the affected vehicles are repaired, although Chrysler maintains some 13.4 percent have actually been fixed. The agency is asking the automaker to reach out to owners "proactively," and get them to bring the Jeeps in dealers. According to the the feds' statement, the company "has nearly 400,000 parts available" to perform the fixes, and it's still producing more. Friedman's letter to Marchionne goes even further, alleging NHTSA has received reports that dealers are turning customers away who request the recall. He asks the CEO to prove within 15 days that these claims are false. "Given the low rates of repair that Chrysler has reported more than a year after the recall, significantly more aggressive steps are required," says a portion of the note. According to The Detroit News, Chrysler has subsequently promised to speed up the recall work, vowing that all dealers will have at least 12 repair kits in stock by Monday. Further, it has announced plans to ramp up its notification campaign with Facebook ads and public service announcements. Scroll down to read NHTSA's full statement on the matter, and Friedman's letter to Marchionne can be read in PDF format, here.

GMC wants to target Jeep with compact crossover

GMC execs might consider adding a Jeep competitor to the range, but rather than new rumors of a Wrangler-fighter, this time the Professional Grade brand could go after the Renegade. Division boss Duncan Aldred would like to broaden the brand's lineup with a subcompact crossover. "I keep telling everyone, 'How can General Motors' truck brand not be in the fastest-growing segment in the industry, an SUV segment," he said to Automotive News but wouldn't confirm whether the model was under development. General Motors already offers small crossovers like the Chevrolet Trax and Buick Encore, but the CUV segment in general continues to drive auto sales in the US. Adding a similarly sized GMC to the mix might increase the automaker's volume by appealing to different customers. "A GMC buyer is very different from a Buick buyer. This is like comparing the Fiat 500X to the Jeep Renegade. They are very similar but appeal to different people," Dave Sullivan, Product Analysis Manager at AutoPacific, told Autoblog. Aldred started the speculation about a Wrangler-fighting model in an interview in late 2014, and the company reportedly even raised the idea of an offroad-focused vehicle to dealers to see how they reacted. The development process was only in the very early planning stages, but the brand considered using Hummer for a little of the new product's inspiration. Aldred later suggested to journalists the possibility of adding a compact or midsize SUV to the GMC range in the next 10 years to appeal to more buyers. He didn't comment directly on the possibility of the Wrangler-challenger at the time beyond saying: "I can't confirm that ... everything's on the table." Related Video: