I just got a Resonator Delete.
I was under the impression it would be a mild upgrade. It made a huge difference. As if I opted for an entire muffler upgrade.
Dang how that resonator restricted sound!!!!
I got it for $125 for user reference in Glendora, CA at "Startek Mufflers"
http://www.youtube.com/watch?v=5oD5hPQ_FN0
http://www.youtube.com/watch?v=GRFRKB6drMA