The filters outlet has an internal velocity stack to improve air flow into the intake tube. Each filter is embossed with ZZPs logo on the end and includes a stainless worm drive clamp. The below list shows the size and which intake each filter comes standard with.
ZZP Air Filter ATS Model 2 6 Base 4 5 8 Top 7 1 Length 3 Inlet at MechanicSurplus.com ZZ-AF-2
K&N Engineering Air Filter Cleaning Kit 99-5050
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K&N Engineering Air Filter Cleaning Kit 99-5050
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K&N Engineering Air Filter Cleaning Kit 99-5050