I did not know that. My coworker was a taxi driver for quite awhile and was very well-known by the others in the area for his driving skill. Plus the taxi cars were crown vics. I dunno if there's a different diff in the back of police cars or if it's cuz of the suspension or what, but he loves taking entrance and exit ramps a lot faster than you should and the back end will hang in there then *poof* let go. No slight screech of tires or real body lean. Then again, he really doesn't drive like a normal person, so your results may vary.
Even his older gen vic gets looks from people and it doesn't have anything on it besides dark windows. I can see why you'd want to make it look more cop like for shits and giggles, but I can't understand why you'd want to soup it up.