Sure turk. Check out the technical articles at the thunderbird club of america...
http://tccoa.com/articles/
If I was doing it myself, and wanted to keep cost down... I'd go for a 3" exhaust pipe and a borla muffler. Borlas are expensive, but the sound is nice. Flowmasters sound good too. Dual exhaust isn't really necessary unless you plan on building your engine a huge amount ( >50 hp over stock, whcih amounts to $1500+ in engine mods.... )
If you have any more questions feel free to ask.