cold air intake?

The Mazda3 and Mazda5 have the same engine and set up under the hood, so would a mazda3 cold air intake fit a 5??

i would contact a dealer for CAIs such as Injen, AEM, K&N and see if they fit universally for those two vehicles... but my guess is that they won't fit the same at all. you have to keep in mind the different wheel well spaces that the cold air intakes must go to... both those vehicles have different dimensions so that would most likely not make the CAI universal for those two vehicles.

^agreed

I concur