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No extra debris, if anything there is less build up of belt dust.
The CVT was not sealed to begin with, it has small vents and an intake at the front.
The holes are drilled to face the rear because it inhibits water and dirt from being directly scooped inside.
The variator fan is supposed to draw air from the front intake which is much larger than the stock vents in the bottom or rear of the CVT cover.
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