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K&N Make-It-Yourself Foam Filter

Click for a larger picture of K&N Make-It-Yourself Foam Filter

Brand: K&N Engineering

If you have an old Filtron foam air filter, or if you just can't seem to get any other air filters to fit your application, this kit may be the answer. Although not as effective as a K&N oiled gauze filter, the open-cell foam stops 90% of dirt and flows very freely.

The generous 7" x 48" (178mm x 1219mm) foam sheet can be cut to fit whatever housing or support structure you have. Hook and loop strips are provided for holding the foam closed. Requires treatment with K&N Filtercharger Oil (Part No. 3851, sold separately). Red only.

If you drive or race in dusty environments, this kit also makes an excellent prefilter, adding only a 2% restriction to airflow.

Part No.
Stock Status
KN 25-3900

Condition: New

In Stock