Hello.
The standard DL silencer can be easily modified to reduce the noise and with very little cost.
Just get some tube that is a tight slide fit into the existing outlet and blank off one end. Slide it into the outlet as far as it will go (blanked off end first ) then mark and cut it to the same length as the existing one also mark which part of the tube is actually inside of the cannister section.
Drill 4 x 1/4" holes evenly spaced into the new tube at a point that is inside the cannister body. You now have a restrictor that you can "tune" by adding more holes of varying sizes to acheive the desired effect. The 4 starting holes will be enough to get the engine to run. A little power loss will be inevitable.
The new restrictor is held in place by drilling a couple of holes thu' both tubes and secured with self tapping screws.
When you are happy with the "tuning" the fix can made permanent by smearing a little exhaust compound around the the restrictor tube as you finally fit it.

Good luck.
Mike.