I am probably a minority with the SHO, as I dont necessarily want a sleeper. I want my exhaust to have a good tone and volume, so that people will see me stopped and think "wow grandpa is going to take forever, I wish I wasnt stuck behind him" and then when I get in it they recant and think "Damn, that thing moves... I want one". Or similar when comming up on someone in the passing lane.
I also am not really bothered by drone, since my mustang has a drone between 45-60 mph (just go faster or slower to avoid it) and my truck drones pretty much anytime the RPM is over 2k but it sounds pretty good IMO. And if it gets too annoying there is always the radio to drown it out.
SO I guess I will be the first to try glasspacks on a SHO... WHenever I get around to doing it I will post exhaust clips and all that good stuff, I will be doing two 18" glasspacks, and replacing the third cat/resonator with an x pipe.