I posted this elsewhere but I thought I'd make a new thread for some current feedback and for future searchers.
I simply cut the rear muffler off and replaced with a flexible exhaust pipe and two straight sections of pipe with new tips. I've got about $50 invested and 3 hours. I would expect an exhaust shop would do it for $150 total. FYI stock muffler weighs 27 lbs.
I am really happy with the results-both looks and sound. Being able to hear the engine reminds you of how often it changes RPM-for the first three drives I thought my transmission was failing!!
http://vimeo.com/1026937
Whad'ya think?