If, too, have been considering a replacement exhaust that's a bit louder than stock and drone-free. The PSE (Pedro Sport Exhaust) is something you should investigate. Pedro claims his simple mods to the stock exhaust yield a throaty, drone-free sound, similar to Porsche's own PSE. I believe he has sound samples on youtube. Check out:
http://www.pedrosgarage.com/Site_3/Make_the_Pedro_Sport_Exhaust.html
Very lightly used S mufflers are readily available for $100-$150. Additional 1.5" ID stainless tubing would be $50-$75, depending on the source. He says it's 5 hrs of labor for the entire job, including brazing/welding in the tubes. If you're capable of doing this yourself, the whole setup can be exceptionally cost effective. Even if you can't, it's still pretty reasonable.
I see you're in NJ. This is a place I've been aware of for 20+ years in Trenton that does only custom/performance work. I'm sure they could do the job blindfolded.
http://www.mufflex-performance.com/
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