hello i have a ? about cold air intakes anyone have an idea what intake would be the best for my 2004 FX4

 

I found that to be a personal preference. There are some 19 different companies who make Cold Air Intake products. Some make dry air filters, others require oil on their filters, some have a closed filter box, others are open but seal when the hood is closed.

I believe all the CAI product produce about the same amount of horsepower and torque.The most popular seems to be K&N.Check out this post, it has some good info in it.

https://www.f150forum.com/f7/cold-air-intake-9159/