Not sure which 2001 Toyota Sienna Air Filters are right for you? We have over 795 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Darryl T from Leawood, KS said, "Have not had long enough to tell about performance. Do know this after speaking to a K&N techie, Put the filter in and leave it alone. Even if it appears to get a bit dirty it is still breathing well.I figure these filters wil save me a few bucks over time!!!"