Exhaust System

So me again, the new mustang dude...(inline 6 200ci)

So I want to get a new exhaust system. The one that is on the Mustang now I'm sure is from 1966...So what do you guys think? Its a single tail pipe, should I just put in a new one, or maybe upgrade to dual, maybe some Flowmasters?

I just would like to know what you guys think or would do.

8) that depends on whether or not oyu are going to use a header or not. duals are nice to have, but a well built single exhaust works well also.