If you absolutely have to have an air filter, BMC tends to be better than K&N from what I know.
Your car is an air pump. Open up the exhaust first, then go to the intake. Not saying a drop-in filter is best, other options are out there waiting for you to search them out. Once you've freed up both ends, you get some extra performance as well as a great new sound.
Everyone stop talking about air filters now.
(lol)
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