The spark plug will be the best indicator of how the muffler has changed things. Perhaps you should do an idle, mid-range and WOT plug chop.
Seriously, you'd love that welder. The learning curve is not steep.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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