I have heard that k&n filter would let sand in quite easily?
But obviously that is not so..
I bought few different air filter.
One uni filter and im going to use on that pipercross triple filter, so there is 4-layers.
Pipercross is this model.
And also bought one bzm filter, but that is only grass tracks.
I think that bzm filter has made also pipercross, so that is not bad quality filter.
But in pure sand, there must be a good filter, or engine will be damaged.
Do you guys clean your filter after every run on sand?
And what do you when you clean your filters?