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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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'12 SE Sport 5Dr |╠╬╝|Sterling Grey Metallic|203a|Moonroof|17" Mach/Paint Whls|K&N Typhoon|MS3 RMM|Steeda STB, RSB
'01 ZX3|╠╬╝|Pitch Black|Prem. pkg.|Moonroof|SVT Snorkel|SVT Springs|S2 Dampers|Steeda STS|Magnaflow exh.
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