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RE K&N: More hassle, less effective than paper and NO MPG Gain.
If you have a MAF and over oil the K&N filter, the MAF will need frequent cleaning.
If you under oil the K&N filter, it's next to worthless.
When you clean the filter (likely required more often than K&N suggests), you must let it throughly dry (several hours) before re-oiling and reinstalling.
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