1. The cai has the possibility and is far more likely to take in colder air than the oem. Clearly I dont have data for this but if you look at the design it is clearly in theory suppose to take in colder air.
2. The oem tube is much smaller in diameter than the cai and ram air intakes. Clearly more air can be pushed at a given time than the oem.
3. The filter can get dirtier much easier, but they in some cases be rinsed out and cleaned with water or a recharge kit and in the k&n filters have a million mile warranty. I'm sure that these have the warranty because they are that good.
4. The intakes do add a slight gain in power in most cases. Follow my link I provided in the earlier post.
Even though many people say they dont add that much power, this is slightly true, but just think about the compounding effects of say a more free flowing intake, slightly bigger throttle body, and header. The combination of all of these helps, but remember if you have a restriction in the system i.e. oem intake, oem header, exhaust etc.. this will still hinder power gain. This is why I think that the cai or short ram are a good idea in the long run considering that most of us will add other things later on that could benefit from this.