I agree, that I would rather not do any irreversible mods to the exhaust. the system is in very good, original condition. This bike is still street legal and I also have other bikes for competition. I do like a quiet bike and this one is so quiet I can sneak up on Bambi.
I will give the cam gear advance a try when the part arrives. Maybe if I ever assemble that box of parts into a full TLR200, I will try a different exhaust.