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The OEM intake is already a cold-air intake. That is, it is fed by air from outside the engine bay and it's pretty well sealed up so there's very little chance of bringing in hot air from the engine bay.
The Corksport setup is exactly bass-ackwards because, as Batcave mentioned, there's no sealed box preventing hot air from the engine bay from being sucked in.
The AEM unit is better but there's no way it doesn't leak hot air into the intake.
Another thing to think about:
Good-Win Racing doesn't sell a cold-air intake for the ND1 Miata (I just bought one so I'm doing tons of research). Why? Because there was no benefit seen on the dyno with whole intake kits or with just removing the air filter from the stock intake.
This isn't surprising given how much Mazda leans on Helmholtz resonance tuning to get the most amount of power from a given engine design on most/all of their cars. I'd be surprised if any aftermarket CX-3 intake was actually better in any objective, measurable way (i.e.: not aesthetics) than factory. In a lot of cases, the perceived power gains come from fooling the MAF by screwing with the airflow around it.