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The main benefit with going with a K&N filter (or similar) is the $$$$ Let me break it down for the deet-da-deets, You spend ($20) on oem, and replace it every 30,000 miles. Depending on your environment (dirty,sandy,dusty) you might/should replace at 15,000, So how many oem filter changes will you do? K&N for my 2011 335i is $54. So you tell me why after my free maintenance is up, why would I continue to pay ($20) for a filter when K&N will last a lifetime for only $54! Look at 98% of off road race trucks (including mine), they use K&N and have never have problem with foreign material ingestion.
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