K&N High Flow Air Filter - HD-0818 Replacement — Harley-Davidson Softail Slim S, Road King, Road King Classic (2008-2017)

K&N HD-0818 high-flow air filter for V-twin motorcycles, featuring pleated cotton-gauze media that increases airflow while maintaining excellent filtration. Washable and reusable design with application-specific sealing ensures direct fit into the OEM airbox without fuel management modifications.

Features

• Pleated cotton-gauze media for increased filtration surface area
• Washable and reusable — pre-oiled and ready to install
• Direct OEM airbox fit with application-specific sealing bead
• Multi-layer woven cotton construction
• Long service intervals between cleanings
• Made in the USA

Specifications

• Brand: K&N
• Manufacturer Part #: HD-0818
• UPC: 024844200549
• Length: 6.31 in
• Width: 6.56 in
• Height: 3.5 in
• Weight: 1.8 lbs

Fitment

Fits V-twin motorcycles. Check your application with K&N's fitment chart to confirm the exact make and model compatibility before ordering.

Frequently Asked Questions

Do I need to retune my fuel management with this filter?

No — K&N designed this filter to deliver increased airflow without requiring fuel mapping changes in most stock applications.

How often should I clean and re-oil it?

Inspect at each oil change. Clean and re-oil when visibly dirty using K&N's filter service kit — typically every 50,000 miles in normal riding.

Does it come pre-oiled and ready to install?

Yes — the filter ships pre-oiled and ready to install straight out of the box.

Will this fit my specific motorcycle model?

This part fits V-twin motorcycles, but airbox designs vary. Verify your exact year and model against K&N's fitment guide before ordering.