I was considering a K&N on my 03 Road King mainly because of the nut on the end. Their reply to my micron rating question:
"Thank you for your interest in K&N products. At this time we do not have the micron ratings available. However, I can say that our filters protect your motor just as well if not better than our competitors’ oil filters. Our media allows for high flow rates while protecting your motor against harmful dirt and debris. If you have any further questions or comments, please reply to this email or call our Customer Support Team at (800)858-3333.
Thank you for writing and have a great day.
Best Regards,
Daniel Shoemaker
Product Specialist"
i vote MC FL-820S unless your going past 5k in which i would rec M1, Fram EXTENDED GUARD, or bosch distance plus
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2004 F150 5.4 160k-Castrol TXT 5/40, Distance+ 3410-KREEN
2004 Explorer 4.0 130k-PU 5w30, Distance+ 3410