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Not saying its incorrect ET but I find it hard to see how air flow can go backwards in the air intake, whilst your driving. Even with this "turbo surge". My old ZD never saw black deposits on the air filter.
Just never seen or heard of this.
Besides the black on the outside of the filter element is from the intake side of the air box, via snorkel. If it were from the engine, it should be on the inside of the element.
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