Yes, I think. If you're hell bent to make a good silencer and don't care too much for that stocker, then the best "muffler" is from modding it.
Save your connecting pipe, and cut the end off. Remove the cap on the discharge end. Get a piece of pipe the same size as the one that is already there, make it long enough to go all the way down the center of the muffler. The center pipe needs to be drilled crossway a lot. I just drilled mine straight through, turned 1/4 and drilled it again. Repeat until the hole piece is full of holes. Leave enough space at each end to put on the caps.
Actually you don't have to keep the piece you cut off, just get a whole new center pipe long enough to reach where you want it to go.
Check my photo in the MB Challenge thread for the way it turned out. It's got a cool sound but not loud.