With a single exhaust it sounds like your Car is a V-6 coupe. There are a lot of exhaust sysytems on the market. Take your time deciding what system you want to put on your Car. Listen to a few Cars that have allready been modified. You only want to buy once! CMC member Nancy Ruiz has a 06' V-6 coupe that has a mean growl to it.
I took a year and a half deciding what system to put on my Mach. Went with a Magnaflow Catted X-pipe and Catback. It is a bit on the quite side right now, but I have to deal with an uptight homeowners association, that gets bent out of shape over a neighbors Harley. I plan on adding Bassani Mid-lenght headers later, should bring it up to what I want.