If your permanent residence is in PA, your NY stuff won't work. Drive conservatively until you've got PA plates, since cops can see you're from NY coming and going. On the upside, it's only like $7 to fight a citation here.
I've yet to find a state that's easier on speeding out this way. Don't exceed the limit by more than 14mph, and you're alright by them.
Okay, so you need a cat unless you can find a shady mechanic to do your inspection (or you have a truck and cops can check easily). And you've got to go light on the tint (70% with nothing on windshield if I remember correctly). And you can't have strobes, light bars,under lighting, etc. Or light-up wipers. Ridiculous = Tasteful?