You can not legally ride a motorized/electric bicycle in New York State on public roads/highways.
They are pretty quiet with the stock muffler. I put a Poo-Poo pipe on mine and now its a little louder but sounds a lot better.
I got a Huffy Cranbrook. Make your life easier and find a bike with a 1 inch seat tube and 1 inch down tube.
Here is my Cranbrook if you wanna see :