I can assure you we have no vested interest in what CAI's we have tunes available for. When development time rolls along, we contact the popular CAI manufacturers, and let them know that if they can provide us with a kit for testing, that we'll make tunes for it and put it in the tools. its a win-win for them, as they know they can't sell the intake without a tune, and if the customer has to hunt down a custom tune just to get the CAI bolted on, they lose business.
The list of supported CAI's for 05-09 GT is entirely different than those supported by 04-08 F150, due to who did and did not respond to our offer to develop these tunes for them at the time.
Also, the size/shape of the MAF housing is only a part of the whole enchilada, as the shape leading into and out of the MAF housing has a tremendous effect on low rpm airflow and not dialing in the MAF output curve 100% will lead to drivability issues.