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It's actually being done to compensate for issues stemming from opening up the engine airflow with a removed airbox and/or aftermarket exhaust systems. If you're not having minor backfires/popping on deceleration, I wouldn't worry about it.
That said, I haven't heard much/anything as far as major engine failures that can be directly linked to this. Usually the problems people experience are changes to the jetting needs due to the removal of an airflow path. Sometimes people find their bike runs better with the Kleen Air in place. Some folks have bikes that are happier without it.
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