Here in NZ we can buy chinese copy K&N for about 1/4 the price.
I still dont bother with them.
For a free filter I like folding tee shirt cotton 2 or 4 times depending on the weave and fitting with a hose clip over a 2-4" tube/flange.
K&N are designed for maximum airflow. Ecomodders are trying to achieve minimum airflow. Even a really dirty old paper filter will usually do
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