I have an old lawn tractor that I want to make quieter. It has a single cylinder
Briggs & Stratton 8hp engine that has a muffler that doesn't muffle. I replaced
that one with one for a 9-16hp B&S engine, but it didn't get any quieter. These
seem to do nothing except provide back pressure.

Anyone have a design for a muffler that will make it possible to talk with the
engine running without shouting?

David