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... kn filters are not.
Be careful, the drop-ins just substitute existing paper element in stock CAI.
Some custom K&Ns, which also replace the intake tube, actually are aftermarket CAI. They are usually the only ones I've seen that can demonstrate HP increase at high RPMs on limited makes/models.
That said, I don't advocate K&Ns, they are largely a marketing gimmick.
Anything that replaces your intake tube but still leaves a big-ass cone filter under your hood, sucking up HOT air from your engine compartment, is not a cold air intake.
You know, where cold air is...