They need to cram the Mustang V8 into the 500.
Then, they need to strip all options from the car -- radio delete, convenience package delete, sound deadening, etc. -- except for traction control and a cold-air induction box mounted behind a functional 'Air Grabber' scoop.
Lastly, they need to market it as the 'Hemi GTS' with two unique paint options exclusive to the model: Nuclear Fireball Orange and Petty Blue.
Result: 12.10@121mph in the 1/4 mile.