I know this has been done to death, but once you get it done, it is hard to resist the temptation to not do it.
I had my exhaust installed last Saturday for just under $700.
I kept my passenger side pipe, and then had a GT pipe installed on the driver's side. They then added an "H" section for the balancing pipe.
I'm not quite sure what type of flowmasters I have, but I do know they're 40's. 40 Deltas or Super 40's is not something I know. The guys at the shop didn't tell me, but I'm just going to assume they're Deltas.
My wife loves it and now she wants the same thing done to her '04. Except for her I'll go onto E-bay and buy some original 40's for her to use as well as maybe some MAC long tubes. She was somewhat offended that I would buy her "cheap internet junk" whereas I got to use a "custom made" set-up.