check your local regulations regarding cold air intakes. In some areas, cold air intakes are considered an improper modification to the vehicle.
Who said? I stated it but knuckleheads like the CHIPS (California Highway Patrol) think they know what and what is not legal for gasoline engines. I wonder what they think of the Toyota Prius.
This heresay has trickled down to some dealers saying that some intakes violate car warranty. That is bunkus, refer them to this "the Magnuson-Moss Warranty Act":
http://www.knfilters.com/warrantyletter.htm