The only things you could really do is pop the rivets or screws on the end of the can and repack them. D&D pipes are notorious for being ridiculously loud at higher RPMS. I personally despise them. Another thing you could try is getting a pipe insert. Many pipe companies make them and they significantly quiet the exhaust tone. You may sacrafice a tiny, almost insignificant amount of power though. Look into those inserts. D&D might not make them for their pipes, but other companies do for theirs. The concept is the same regardless of pipe, you would only have to figure out a way to mount it in the can, which wouldn't be hard at all.
I don't really mind my D&D pipe. Loud pipes DO save lives. The bike came with the D&D and seems to be okay I guess. There is no doubt however that at higher rpm's the fooker is loud! I would probably put a Micron can on a bike if I bought a bike stock. Nothing earplugs can't solve.
D&D=nice! i would get one but i already have enough problems with our so called "law enforcement" officers so i cant really afford the attention. it sucks to know that i have a disease called "stunter" disease and cant help to wheelie and stoppie everywhere i go! im gettin an akrapovick bolt-on whenever i can save up $579.99!!! parts for these bikes are too over priced!!!