I have the last version of them made. The silencers do ok on the noise if you pack them with the expensive two stroke packing instead of R13 or stainless packing. Never had a problem with noise when stopped in Roscommon/west branch/St Helen area or Baldwin.
The spark arrestor was another issue. DNR in Baldwin followed me back to my truck and made me load it up. We went to the hardware store and found heavy duty filter-screens in the plumbing department. Pulled the end cap off, set it in, screwed the end cap back on and drove back. He stopped me when we were in loading it. I explained what I did, showed him receipts, he looked at it and told me to enjoy the trails.