i think that cold air kit will get dirtier and more damp cos the filter sits lower where the fog light is. if the fog light / cover is removed... it makes the filter more vulnerable to dirt and water.. i chose short ram with the ducting . why? wont get wet, will get dirty. less restrictive than cold air cos its a short 3 inch piping i think.. the ducting is bigger than 3 inch. more air flows proportional to the speed as it is mounted where the fog light is. finally.. its a cheapos way of a CAI thats my theory.