Your engine will inhale more dirt and dust, you can't have big gains in airflow without sacraficing that fact. But will it cause any measurable harm to your engine, No not really. I have run them for years on different vehicles. I moved away from them for no oiled filters like Somota, They are cheaper flow almost as well and I don't have to oil them. Not paying 3000P for a air filter.
But to each his own, I normally throw the stock airbox in the garbarge on any vehicle I own and do a conical air filter. I have not used a paper air filter since like 1990.
Here's what K&N says about their filtration. http://www.knfilters.com/efficiency_testing.htm
By the way the old panty hoses air filter pre-clearner trick is cheap and works very well in high dust enviroments.
Can go on over the filter or in the tube.
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