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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.

EPA suspected Fiat Chrysler of using 'defeat device' in 2015

U.S. regulators told Fiat Chrysler Automobiles in November 2015 that they suspected some of the automaker's vehicles were equipped with secret software allowing them to violate emission control standards, according to emails disclosed on Friday. The U.S. Environmental Protection Agency and California Air Resources Board accused Fiat Chrysler in January of using the software, known as a "defeat device," to illegally allow excess diesel emissions in 104,000 Jeep Grand Cherokees and Dodge Ram 1500 trucks built between 2014 and 2016. Byron Bunker, director of the EPA's Transportation and Air Quality compliance division, said in a January 2016 email to Fiat Chrysler, obtained by Reuters under the Freedom of Information Act, that he was "very concerned about the unacceptably slow pace" of the automaker's efforts to explain high nitrogen oxide emissions from some of its vehicles. Nitrogen oxide is linked to smog formation and respiratory problems. Bunker's email said the EPA had told Fiat Chrysler officials at a November 2015 meeting that at least one auxiliary emissions control device on the car maker's vehicles appeared to violate the agency's regulations. Mike Dahl, head of vehicle safety and regulatory compliance for Fiat Chrysler's U.S. unit, responded in a separate email that the company was working diligently and understood the EPA's concerns. He added that if the EPA identified Fiat Chrysler vehicles as containing defeat devices it would result in "potentially significant regulatory and commercial consequences." The documents redacted the vehicles named, but two officials briefed on the matter said they referred to diesel models. The EPA's November 2015 meeting with Fiat Chrysler came two months after Volkswagen AG, mired in a major tailpipe emissions scandal, admitted to installing secret defeat device software in hundreds of thousands of U.S. diesel cars to make them appear cleaner than they were on the road.

Ram, Jeep redesigns on hold, Alfa Romeo models may come sooner

Last summer, FCA outlined an ambitious five-year plan that sketched out the company's product intentions for each of its brands through the end of 2018. However, even the best strategies sometimes need tweaking. According to Reuters after speaking with unnamed people at auto suppliers, FCA is now possibly delaying at least a dozen projects in North America for a variety of reasons. From vehicle to vehicle, these postponements allegedly last anywhere from just a few months to over a year. The sources from the suppliers claim that in some cases these tweaks are for engineering and design changes. The next-gen Ram 1500 reportedly has among the shorter delays and is being pushed from mid-2017 to November 2017, according to Reuters. Also, the much-discussed future Jeep Wrangler is allegedly moving a little later to July 2017. Among the vehicles purportedly seeing longer delays, the next-gen Grand Cherokee could get pushed back about a year to 2018. That then forces the launch of the three-row, luxury Grand Wagoneer to be even further away. Jeep's upcoming C-segment CUV and the all-new Chrysler 300, Dodge Charger, and Challenger might also see postponements. The one brand allegedly seeing an accelerated plan is Alfa Romeo. Without going into detail, the sources from these suppliers claim that the Italian automaker is getting even more vehicles for its lineup and could get them even faster than planned. "Those plans need to be flexible and fluid, with the potential to add some vehicles, pull some forward and extend the life cycle of others," FCA said to Reuters about all of these allegations. "We look at these programs on a vehicle-by-vehicle basis." Investment in the auto industry has been a major topic for FCA CEO Sergio Marchionne as of late. He believes consolidation is necessary so that companies aren't burning money on the same projects. Related Video: News Source: ReutersImage Credit: Bill Pugliano / Getty Images Plants/Manufacturing Alfa Romeo Chrysler Dodge Fiat Jeep RAM Sergio Marchionne FCA fca us