Witness This 1,200-HP Jeep Grand Cherokee Trackhawk Thunder Down the Quarter in 9.66 Seconds

This is what happens when Hennessey adds nearly 500 horsepower to an already blistering-fast machine. 

Hennessey

If the Hellcat-powered Jeep Grand Cherokee Trackhawk isn't fast enough for you at 707 horsepower, then this Hennessey-equipped upgrade with an extra 500 hp may be better at scratching that itch for crazy acceleration. 

The bruiser SUV is able to run 11-second quarter-mile times from the factory thanks to its supercharged 6.2-liter V-8 and all-wheel-drive system, making it no slouch even when compared to exotic supercars of today. That said, warming over the Jeep's powerplant can quickly result in a massive output increase without much extra work. Hennessey's HPE1200 upgrade kit takes that advice as gospel and reconfigures the truck's ECU while also making use of a monstrous 4.5L blower among other tweaks, cutting the quarter-mile time by two whole seconds in the process.

Officially, engine power figures are 1,200 hp at 6,500 rpm and 1,080 pound-feet of torque at 4,200 rpm.

The aftermarket add-ons in question can be seen at work below:

Not only is the time drastically quicker than in stock form, but the trap speed is also kicked up to 145 miles per hour. That's a higher figure than the Trackhawk's revered Mopar brethren, the Dodge Challenger SRT Demon, which eclipses the quarter mile one-hundredth of a second quicker at just 140 mph. It also beats out the insanely rapid McLaren 720S as well as Lamborghini's Hurac├ín Performante (by nearly 10 mph). 

To replicate this feat, you'll need to have a lightning-quick reaction time, access to 109-octane race gas, and a major chunk of change.