I drove the Jeep Grand Cherokee Trackhawk some time ago and I loved it. It’s a ridiculously powerful SUV and its all-wheel-drive system makes it, in my opinion, the best of the Hellcat vehicles. Bone stock it kills the quarter mile in 11-something seconds – your results may vary. 
Hennessey, known for a lot of things including making cars faster, has made the Trackhawk even faster. They opened the engine are replaced pistons, rods, and the camshaft. They ported the cylinder heads and added long tube stainless steel headers. On top of the block is a huge 4.5L supercharger. On 109 octane unleaded fuel and 22 psi of boost pressure, the HPE1200, as they call it, produces 1003 hp and 892 lb-ft of torque at the wheels. Call it 1200hp at the crank. 
That is enough to send this 4500+ pound SUV, on Nitto 555R drag radial tires on all four wheels, from zero to 60mph in 2.3 seconds. It killed ¼ mile time of 9.66 seconds @ 145 mph. That is brutally fast. It’s borderline hypercar territory. Except this is a comfortable SUV. No word on how fast it would be on pump gas or if it is emissions legal. 
Hennessey is only making 24 of these HPE1200 Trackhawks. The price is $179,000, which includes a new 2019 Jeep Grand Cherokee Trackhawk.