Last I remember, when people put in K&N filters, big particles of dust and junk would get into the intake. I assumed this was because they're supposed to be high airflow, which they may be, but that would most likely also mean they're not as good at filtering as the cheap ones you get at any store with an automotive department.
Are they bad/still? Or do they actually filter fine while letting more air through?
Are they bad/still? Or do they actually filter fine while letting more air through?