Have you seen the new police interceptor most agencies across the United States will be driving? It's a retro look muscle car and hopefully once the testing phase is finished, you'll see one in a city near you.
It probably already is a fantastic sleeper.
Look at the stance and the rims and tires.
Suspension isn't sagging, rims and tires look in good condition (from what i can tell) and it is sitting level with the ground.
No hanging exhaust