Like any aftermarket filter it would have to have the right amount of oil to catch dust particles but not have too much that the excess oil goes into the system, also it needs to be cleaned on a regular basis otherwise the above will happen. I think those comments above sound like someone has not done any of that.
If any of you have owned a dirt bike and used it as intended cleaning the air filter after each ride is mandatory and putting just enough oil and not too much is part of that routine otherwise starting and running become difficult. If you are not prepared to do that then OEM is your only option.
Exactly... and all that work for what? 2 or 3 whp? And even that much of a gain is controversial at best.