I have a smoke system I made that uses a 12v submergible pump on my Rotax 912. My reservoir is a 1qt tupperware type vented container. Originally, I plumbed an aluminum line into the #4 exhaust with a brass spray fitting. This worked fine but decided to come up with a better mousetrap. Using a brake line (automobile) I plumbed it directly into the muffler. I did this by welding a bolt onto the flat end of the muffler, a small hold drilled into the muffler and then tighten the brake line fitting into the bolt. The Problem I'm finding now is too much back pressure from the exhaust into the brake line is not allowing the smoke oil to flow.
Those of you that have a smoke system, I would like to hear how you have your system plumbed.