I agree with you on this. It's funny how one or two guys are claiming foam filters don't work yet. I just come from two different forums that have hundreds of members using uni filters on grizzlies and kodiaks for well over the last 10 years. Absolutely zero issues with dust getting by them and that's even with the Yamaha's notorious leaky air intake design over the last 5 years or so. A properly oiled uni and installed correctly will have zero issues.Perhaps...
" they dont keep the fine dust out" on YOUR machine but the UNI and Belray"blue" has been doing a great job on mine for over 8 years now.
The filter is pristine inside, every time I take it out for Cleaning, once or twice per SEASON.
BLANKET comments like yours (who obviously SOMEHOW ....knows EVERYTHING) get rightfully IGNORED.