From mAss Backwards, I learn of the NYPD's plan to add several Dodge Hemi Chargers to its fleet in a test program. Coincidentally, I was just yesterday reading the results of the Michigan State Police annual cruiser tests. The Charger was -by far- the fastest and most powerful car in the tests. It has the CVPI (Crown Victoria Police Interceptor) beat by 100hp, and it'll do 150mph.
And, yes, there are highways around New York City. The NYPD Highway Units are more like Troopers than city cops. Well, maybe not in appearance, but in function.