On top of pulling the mufflers completely defeating the design of the system for the performance characteristics for which it was intended, I think it'd be uglier than sin also.
If it's more/better sound you're after, I'd invest in either a full exhaust system swap, or find some aftermarket matching slip-on mufflers for the stock headers. RPW comes to mind for slip-on's.. Haven't read much but I bet they perform well, and sound good. Unfortunately, they're almost as much, within a hundred or two $, as expensive as a full system.
Whichever option you go with, the stock bike will have a factory-induced lean fuel/air condition only more extreme if the exhaust is free-flowing, so you'll have that to address as well or it'll be rediculously lean.
2013 Hard-Ball - Lloydz VM1-DR cams, air filter, timing wheel, PCV, properly tuned at KMC
Master, Biltmore Lodge #446, AF&AM