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I had never heard of it before you asked, it's not mentioned in my factory manual, & the only kind a quick search turns up seems to be marketed for 2-strokes. In addition, I've had my cans off several times, never used it, & never noticed a difference. I'd say it's pretty conclusively not needed.
Helpful? No idea, as I haven't used it. It might well be, I'm curious now....
Cheers,
-Kit
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