Just a note, I ordered a Ready Filter for my 426 just to try it out, plus I figured it can't hurt to have a spare. In case you aren't familiar with them, Ready Filters are two stage foam filters that come pre-oiled with Maxima FFT and a pair of rubber gloves, for $10!!! I haven't taken the filter out of the sealed bag yet, but the quality appears to be up to par with stock or other aftermarket filters. However, I'm not too pleased about the 2 week wait for it to get here. Just a head's up for anyone considering ordering from Ready Filter (I ordered mine direct BTW).