Quote Originally Posted by Sabrewings View Post
You're measurements are of two different values. They come with the same filter.

The WizAired comes with a 9" long filter with a 4" opening (that's what they mean by a 4" filter). The CAI box comes with a 9" long filter and is probably the same 4" wide in the opening.
x2, you want a 4"x9" cone. 4" diameter opening, and 9" long. I have an AEM Dry Flow myself and I love it. Well at least as much as a man can love an air filter. I am a part of the anti K&N club too. At least when it comes to their air filters anyway. I like their oil filters.