^ Used is a very subjective term. It's is technically used the second you turn the ignition over.
It's not $8 for a K&N its about $14 just to be clear.
I often let my Mazdaspeed6 go two changes before changing the filter because it was a cartridge type and a PITA to change. If a piece of metal is lodged in your filter theoritically it will stay there. But more importantly if you have a piece of metal in your filter your engine is coming apart somewhere.
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When was the last time you did 230MPH in something with 4 seats?
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