Not sure, cause when someone puts a K&N filter in and gets 1-2 HP and then you see a dyno of someone putting a CAI on and getting 10HP, there must be something right about a CAI. Also why would they even do it in mustang magazines? It's not to advertise, it's cause they want to squeeze all they can get out of it and when i see a 10HP increase 5-10 up the rpms, it must be worth something. And they've all stated the rubber inlet tube is restrictive.
But should a CAI be your first, second, or third mod, hell no.
For MAF's they can take a lot of HP before you peg one.
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