Hello. I would recommend the standard factory fit air filters. Get an OE (origional equipment) one and I think that's about as good as you're going to get.
The reason your filter needed cleaning was because it was doing it's job. Although, like you say, another pre filter would help this.
The K&N filter won't need cleaning as much as it's letting more air through (gives a little more power - cool) but it also lets more dust through (no so cool!)
If you've got a raised air intake then the cyclone pre filters are pretty good, like they have on tractors.
Byee
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