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Replacing the air filter with a k&n cone filter


David  Clarke
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Good evening guys.

I have a 2009 Subaru Impreza wrx sti 330s 2.5L and I've been thinking about replacing the standard panel air filter with a K&N cone air filter, could anyone advise if this is a good or bad idea and if so is there something else I could do instead to upgrade the air intake?

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Ask most subaru fanatics and they will tell you its pointless unless your going for “big” power amd it really needs mapped in. A good solution is to just throw in a better panel filter that firs the original air box like cosworth/ k&n ect

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