Bonneville America Forums Forums Technical Forums General Tech Air Filters

K&N filters (wet gauze) are great at passing air, which is why they were initially used mostly in racing applications. However, K&N filters are terrible at actually filtering the dirt out of the air. The OEM filter will actually filter the air better than a K&N.

UNI filters (Cellulose foam) are great at passing air as well (maybe not as well as a K&N, but much better than the OEM filter), plus they filter the dirt out of the air as well or even better than the OEM filter.

If I had to choose I would pick the UNI filter because it actually filters the incoming air better. Over 80% of the dirt that enters any engine comes through the intake. So anything that reduces the amount of contaminates entering any engine is a good thing.

Tom