A filter alone will make little or no difference to engine performance by comparison to an original paper filter. An oiled filter may give a better airflow initially but very quickly will clog with dust and tests show that airflow is actuaaly reduced by comparison to the standard paper filters or non oiled filters.

Use of oiled filters on race engines is a different story as they would be cleaned and oiled in preparation for every event.

A more open induction system is also a different issue.

Peter

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