Your logic is certainly correct. More air out = more air in, assuming the intake side is up to the job.
You wouldn't believe what some of these mufflers look like inside. There's plenty of opportunity for oil to be trapped.
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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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