they dont do anything, your factory air inlet is going to pull colder air than a "cold air intake" i had a K&N(and you wont find a CAI setup for under $200 unless you find one used), and it was junk. it was loud and thats about it. i went back to the stock air box with my truck, and when i did i got better mpg. CAIs in our trucks will just pull hot air from inside the motor bay. dont waste you time, just use a hiflow drop in filter.