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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.

2014 Jeep Grand Cherokee probed by NHTSA for brake problems

Remember how Toyota got in all kinds of trouble over unintended acceleration? Well, the National Highway Traffic Safety Administration is investigating Jeep over unintended braking. NHTSA has announced a probe of 20,000 Grand Cherokee SUVs from model year 2014. Nine complaints have been received, with owners alleging that their Jeeps have issued brake warnings or gone ahead and applied the brakes when no threat was presented. Each complaint alleges that the vehicles have exhibited this behavior repeatedly, leading to a "sudden reduction in vehicle speed in traffic." So basically, a system designed to prevent accidents could actually increase the odds of a collision happening. Speaking to the Associated Press, Jeep spokesperson Eric Mayne said owners whose vehicles are exhibiting this behavior should report to dealers, while adding that the automatic braking/adaptive cruise control systems can be deactivated. Related Video: Scroll down for the official bulletin on the investigation from NHTSA. Date Investigation Opened: JUN 01, 2015 Date Investigation Closed: Open NHTSA Action Number: PE15021 Component(s): FORWARD COLLISION AVOIDANCE Manufacturer: Chrysler (FCA US LLC) SUMMARY: The Office of Defects Investigation (ODI) has received nine complaints alleging inappropriate activations of the autonomous braking system in model year (MY) 2014 Jeep Grand Cherokee vehicles. All nine reports alleged unexpected braking incidents preceded by collision imminent brake warnings and resulting in sudden reduction in vehicle speed in traffic. Two complaints reported autonomous braking incidents with no objects on the road resulting in rapid increase in brake force and anti-lock braking system (ABS) activations. The complaints alleged experiencing multiple events at different locations and road conditions. A Preliminary Evaluation has been opened to assess the frequency, scope and consequences of the alleged defect. The following VOQ numbers are associated with the issues discussed in this resume: 10543837, 10713629, 10690650, 10663320, 10630362, 10596913, 10533622, 10533524, 10651269.

Stellantis will give its brands 10 years to prove they deserve to live

Formed by the merger of PSA Peugeot-Citroen and Fiat-Chrysler Automobiles, Stellantis has 14 brands under its roof, a number that makes it one of the largest groups in the industry. Rumors claimed not every brand would survive, with Chrysler often earmarked to get axed, but the firm said it will give them all a chance to shine. "We're giving each (brand) a chance, giving each a time window of 10 years and giving funding for 10 years to do a core model strategy. The CEOs need to be clear in brand promise, customers, targets, and brand communications," announced Stellantis boss Carlos Tavares during the Financial Times' Future of the Car event. His comments confirm Chrysler fans and dealers don't need to worry about the future — at least not yet. And, against all odds, Lancia enthusiasts can breathe a sigh of relief, too. Former FCA head Sergio Marchionne warned of the brand's demise on several occasions. Alfa Romeo is safe for now, too, as is Vauxhall, which are basically just Opels sold in the United Kingdom with a different badge. The engagement made by Tavares also means Stellantis won't divest any of its brands to raise capital until at least 2031. It's now up to each executive team to make a case for the brand they run, an unusual survival-of-the-fittest strategy in an era when cutting costs is more common than spending cash. Diving into the vast Stellantis parts bin should help even the most troubled brands turn their fortunes around on a relatively tight budget. It seems likely that survive Chrysler will need to look beyond the 300 and the Pacifica/Voyager, the only models in its range, and completely reinvent its image, which is currently nebulous at best. Lancia, once the champion of luxury, performance, and innovation, faces the same challenge. It's not starting quite from scratch, it's relatively popular in its home country of Italy, but it will need to think globally and expand outside of the city car segment to survive. Featured Gallery 2020 Chrysler 300 View 24 Photos Chrysler Dodge Fiat Jeep RAM Citroen Lancia Opel Peugeot Vauxhall