Unlike twin air, this can be a problem with two-piece designs. Each twin air filter is pre-oiled with twin air biodegradable foam filter oil, developed exclusively for twin air by chevron Texaco.
So far seems like a really well made filter. I bought it because it’s the replacement to the power flow kit sold for the 2017 YZ450. The hole kit is over $200 so all I did was bought this filter and cut out the metal screen from my air box which makes it the same as the power flow kit...