I just got the AeroChamber 1 in 2 out muffler for mine, and had a buddy weld it in to my "stock" catback to replace the factory muffler. Looks like stock, sounds like supermodel sex IMHO.
I agree, they don't advertize it a lot but it's one of the best sounding ones out there and flows damn good too.
EDIT: As far as the cutout goes, I have one on mine and on the dyno we couldn't really tell a difference capped vs. uncapped on the AeroChamber. I mean, all the runs were within a few HP anyway so capping it really didn't hurt performance as much as I expected.