Hey guys, I have a Mazda 3 2.0L Touring 2008 andwould like to know what are the main difference between brands in CAI systems. The main brands I´m looking at is Fujita, K&N and Injen. Let me know if there are really many problems when it rains, cause that´s my main concern about getting this item.

 

Hmmm? Research, research, research! There's been much discussionabout this on this forum and on other's.

The differences thatI know mostly about are where they are designed to improve power.
That's the short answer... that, and stay away from the eBay cheapies.
All three you are considering are of very good quality, but their qualities (and prices too) are different.
Point of reference: AEM makes the Mazdaspeed intake. They are virtually the same intake.

 

apparently some intake offer better high-end power, and someoff better low end power, but i doubt it you would feel the difference tho.
i think at most, you get around 10hp from an intake. but i dont think its enough to feel it tho. i tihnk most people just buy them for the 'whoosh' sound :P