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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.

SEMA crowns Mustang, FR-S as this year's hottest cars in the building

After wrapping up the first day of the 2012 SEMA Show, organizers handed out awards for some of the trendiest vehicles on display. Since the whole point of SEMA is to show off new products available in the aftermarket world for use in cars, trucks and SUVs, each year, the show distinguishes the most popular vehicle in various segments. Not surprisingly, this year's Hottest Car and Hottest Sport Compact are the Ford Mustang and Scion FR-S, respectively, while the Ford F-Series brought home the Hottest Truck and the Jeep Wrangler was named the Hottest 4x4-SUV.
More than 2,000 companies are at this year's show, and the display booths represents a "vote" for each car to determing the trendiest vehicles in each of the four categories. It isn't clear if these awards also take cars brought by OEMs into account, but the Mustang and FR-S were definitely well represented by both OEM and aftermarket show versions.
As usual, the OEMs showed up in force at the this year's SEMA Show exhibiting a variety of cars ranging from production-intent cars like the beastly Ford Mustang Cobra Jet to much flashier rides like Scion's Carbon Stealth FR-S.

7 months later, Jeep 'trailer hitch' recall still stalled

For the past few years, Chrysler and its CEO, Sergio Marchionne, have gone head-to-head with the National Highway Traffic Safety Administration and its boss, David Strickland, over the government safety agency's request for Chrysler to recall almost three-million Jeep vehicles due to what NHTSA says is a safety issue that has caused at least 51 deaths. After a three-year investigation and Chrysler's initial refusal to issue a recall because it deemed the vehicles safe and built to the day's federal requirements, last summer, the two parties compromised on a "voluntary campaign" to inspect 1.56 million vehicles, those being the 1992 to 1998 Grand Cherokee and 2002 to 2007 Liberty.
Those vehicles were designed with their gas tanks between the rear axle and the bumper, and NHTSA says that in rear-end collisions, damage to the fuel tank has caused fires responsible for those 51 deaths. The compromise reached last summer was that Chrysler would inspect 1.56 million vehicles and, "if necessary, provide an upgrade to the rear structure of the vehicle." Practically speaking, that meant Chrysler would replace aftermarket trailer hitches, but would take no action if a vehicle had a factory-installed hitch or an aftermarket hitch from Mopar.
A report in The Detroit News says the "voluntary campaign" is just now getting under way, with Chrysler saying last week that the design of the replacement part had been finalized and it was tooling up "to deliver the required volume." Seven months later, still in question is whether NHTSA will crash-test the fix engineered by Chrysler, noteworthy because not only did the vehicles in question pass every safety standard necessary to be cleared for sale at the time, there are still questions (to those of us on the outside) as to how the Jeeps at issue fare among their peers in such incidents. Either way, Chrysler and NHTSA apparently still disagree on the efficacy of the remedy itself: the carmaker says it might help in low-speed crashes but not high-speed collisions, a position the NHTSA is at odds with. All of this means the campaign doesn't yet have an end in sight.