Bumping this again lol, thinking about doing this as I have a muffler delete and between the drone with catless downpipes and the fact that my tips don't line up/stick out to far I'm kinda of getting tired of it, I really don't want to loose that much loudness though. So I'm thinking of either adding some tree branch resonators or trying this out, I would be removing 90% of the packing, all the perforated pipping as well as the resonator in the right muffler and the secondary cats.
Hoping for this, but just a little bit louder
http://youtube.com/watch?feature=plcp&v=rvg88AOQB_o