This is good info to know. I remember early on with my Valkyrie there wasn't much out there initially so a lot of us either cut off the six "piggies" or drilled them. I drilled mine, put the chrome tips back on and got some fairly good (and cheap) rumble out of the stock pipes!
The Cobra Six-2-Six without baffles is definitely loud, and sounds very similar to our old Valk 6 Shooter. I'd recommend giving that a shot if you're looking for loud and good looks.