Not Ranked
You can also build a custom air cleaner with air cleaner foam. I don't know how it flows compared to a good conventional filter, but you can shape the filter in any shape you want..
This is my "prototype"

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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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