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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.

Fiat-Chrysler shows its SEMA lineup

Fiat Chrysler Automobiles already previewed its 2014 SEMA show lineup with some slick renders. Now, the automaker has finally showed us the actual cars, and among the group there are definitely some that stand out more than others.
Dodge is really showing off its muscle at this year's show with four concepts that all pump up the power of the brand's models. Perhaps most interesting among them is the Challenger T/A Concept (pictured above) in striking Sublime Green and matte black. It's meant to resemble the classic Trans Am racer from the '70s. Under the hood is a 6.4-liter V8, and to fit the vintage style there's a pistol-grip gearshift inside.
The Charger R/T also gets some attention with the Mopar concept that shows off what FCA's aftermarket performance arm can do. Mods include an updated body kit, cold-air intake for the 5.7-liter V8 and a coil-over suspension kit. Beyond that, the Dart R/T Concept looks a lot meaner with a black hood with duct work that leads straight to the air intake. The rest of the compact sedan is dolled up in O-So-Orange paint and is fitted with upgrades to improve handling like a coil-over suspension and big brake kit from the Mopar catalog.

Here are all the vehicles sold by the 12 brands of the Fiat Chrysler PSA merger

Sven Gustafson and Ronan Glon contributed to this report. Whether or not the formal merger between Italian-American automaker Fiat Chrysler and European conglomerate PSA Group means the return of Peugeot to the U.S., one thing’s for certain: The combined company will have a truckload of different brands. Sorting out what the deal means for all of them, including where they are sold and built, and whether and where there is product overlap, will be a key question for the two companies as they formalize the merger over the next 12 to 15 months. So far, both sides have steadfastly insisted that no job cuts or plant closures will result from the tie-up. WeÂ’ll see about that. In the meantime, weÂ’ve compiled an alphabetical list of all the vehicles currently sold in Europe and in North America by the various FCA and PSA brands, along with the years they debuted. We've gone into more detail about the European vehicles you might be less familiar with. The joint empire also has an antique store's worth of heritage-laced models and dormant brands, like Plymouth, Imperial, Simca, and Panhard, and it would have been even bigger had FCA not spun off Ferrari in early 2016. Alfa Romeo A legacy Italian sports car brand with roots in racing, Alfa Romeo has been struggling with declining U.S. sales. Giulia (2015): AlfaÂ’s rear-wheel drive sports sedan competes against German luxury sedans in North America and Europe. 4C (2013): The lightweight mid-engine rear-wheel-drive sports car is being phased out. Stelvio (2016): The Stelvio is a small luxury performance crossover that competes against the likes of the Porsche Macan and BMW X3 and is sold in both Europe and North America. Giulietta (2010): Sold in Europe, this compact hatchback is AlfaÂ’s entry-level model. After initially planning a rear-wheel drive 2020 update, the Giulietta is reportedly being nixed as part of FCAÂ’s latest product plans.   Chrysler Despite lending its name to its parent company, questions abound about the future of this legendary but faded brand, which is not offered in Europe. 300 (2011): Despite rumors of its pending demise, the four-door sedan lives on mostly unchanged for the 2020 model year, at least. Pacifica (2016): The successor to the Town & Country is ChryslerÂ’s bestselling model by a long shot and comes in gas-only and plug-in hybrid versions. Voyager (2019): ChryslerÂ’s newest minivan launches as its entry-level minivan for the 2020 model year.