Its not available for the I-4's.

The stock airbox is all convoluted, with very small diameter piping, and after all the twists, turns, and resonators, the air being sucked in is actually warm engine bay air. Their is also the factor of a longer intake stack/runner providing more torque, and more useable power than a really short one; up to a point of course. (even if you had the same temp air being sucked in, a filter right at the throttle body would not be as good as one on a longer, tuned stack like the AEM & Comptech)

The Comptech uses a high flow filter, and a tuned higher diameter intake stack/runner both before and after the filter. Their design is the best CAI IMO just because the gains are great, and it has none of the downsides to other CAI's. The filter stays cleaner for much longer, the filter itself wont get dirty or wet in the rain, its quieter, and when you do need to do filter maintenance, its in the engine bay instead of in the wheel well.