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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.

Six 'shut up and take my money' cars

Any time you see this iconic moment in pop culture - Shut up and take my money! - posted in response to a new car reveal, rumor for an upcoming model or even lip-service to a vehicle that should exist, you can bet there's some intrinsic good in the idea. Though depending on the person offering up the cash, that good could take the form of extraordinary form, functionality, weight savings, power, handling, etc. You get the idea.
In fact, when I first proposed this list, I reached out to the Autoblog staff to help me brainstorm. Here are some of the ideas they offered up that I ultimately didn't use: Jaguar XE Coupe, Pagani Huayra Roadster, Mercedes-Benz S-Class "parade car" (cabriolet), Morgan 3-Wheeler with Ducati V-twin, Ford Transit Connectamino (pickup), Mercedes CLA63 AMG, Ford Fusion 5.0, BMW i8 Spyder, Lexus RC-F Shooting Brake, Volvo XC90 Polestar. Oh, and things we collectively wanted to stick Dodge's Hellcat in were almost as numerous as models that Fiat Chrysler Automotive currently makes (though none quite so compelling as the Grand Cherokee you see above.)
Ultimately though, while I used a couple of ideas from my colleagues, the list of cars I'd shell out for unquestionably is very personal. Though it isn't complete, what follows is a selection of cars whose very existence would prompt me - or the trust-fund-baby versions of me - to utter without hesitation: "Shut up and take my money."

Jeep Begins Fixing 1.56 Million Recalled Grand Cherokee, Liberty SUVs

Chrysler is just now beginning the big job of fixing 1.56 million older Jeep SUVs seven months after a recall was announced, according to The Detroit News. Jeep Grand Cherokees sold between 1992 and 1998 and Jeep Liberty models sold between 2002 and 2007 are being recalled because the gas tank can leak in the event of a rear-end collision, leading to a fire. The National Highway Traffic Safety Administration originally requested the recall of 2.7 million vehicles. Chrysler initially disputed NHTSA's findings and seemed willing to go through a court battle until an 11th-hour deal reduced the number of vehicles involved in the recall. The remaining vehicle owners left out of the recall will receive a "customer service action" notification and may not get fixed. Chrysler says the vehicles are safe and need no repairs. Fixing the 1.56 million Jeeps will cost Chrysler $151 million. NHTSA cited 51 deaths causes by such tank fires. Chrysler plans to install protective trailer hitches to protect the gas tanks, but even the automaker admits the hitches will only provide incremental protection in a low-to-moderate speed rear-end crash. Related Gallery 2014 Jeep Cherokee Test Drive View 9 Photos Recalls Chrysler Jeep jeep liberty