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Old 10-20-2021, 04:51 AM
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mrmustang mrmustang is offline
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You need a K&N 66-3040 (or similar)unit. I've used this on several of my FE powered Cobra replicas (2-ERA's, 1 Contemporary, 1 Unique). If the air filter clearance is still a bit too close for your comfort, you can replace the 14X3" air filter with a 14X2.5" to 14X2.75" filter (there are four or five height incremental K&N filters available).

Now, with that said, before you spend any money, you need to see exactly what CFM worth of filter assembly you need to properly feed your engine.

Using the simple formula

A= effective filter area
CID=engine displacement
RPM=maximum RPM expected

Using the CFM formula of height X diameter x 6 x 3.14

Also keep in mind that the 14" extreme top flows 500cfm by itself.

Hope you find this helpful.


Bill S.
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Last edited by mrmustang; 10-20-2021 at 04:53 AM..
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