Ford Focus Forum, Ford Focus ST Forum - View Single Post - Basic K&N filter
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Old 10-31-2012, 04:36 PM   #2
TboneZX3
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What I Drive: '12 SE Sport, '01 ZX3, '67 Bronco

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There's been lots of discussion about this--search is your friend.

To answer in short: the stock filter is cylindrical, the K&N replacement is part #E-2993, and the consensus is that it improves hesitation and drive-ability.
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