[bramwith]

Have a 2009 500-A looking to replace the sponge airfilter does the new one have to be dry or soaked in oil .

[NMKawierider]

So far the best one had been the Unifilter two-stage foam filter in conjunction with a quality foam filter oil treatment such as FAB1, FFT, PJ1, Bel-Ray and their respective cleaners.

[Ulfthednar]

Ive had excellent results using a pre filter sock over the Uni as well.
The amount of dust and debris it keeps from getting to the filter in the first place is astounding.
I've found I can clean it every so often as it really protects the uni and not clean the whole air filter as often.

[Johnny B]

Ive had excellent results using a pre filter sock over the Uni as well.
The amount of dust and debris it keeps from getting to the filter in the first place is astounding.
I've found I can clean it every so often as it really protects the uni and not clean the whole air filter as often.

           using the same set up. Have yet to clean foam filters, just the outerwares.