Has anyone ceramic coated there stock exhaust on a 600? Any performance increase or sound difference? Ruffely what should it coast and anyone know of anyone whom does it in the North East?

You won't notice any performance difference. It sounds about the same...tiny bit more exhaust noise through the pipe, because the heat shield helps to dampen pipe noise. Other than looks, thats about the only benefit. Most people are paying about $100 for the pipe/Y pipe. Personally, I'd send to to Jet-Hot in Pennsylvania.

the only benefits are rust proofing, and bling factor.