Hello, as mentioned in my other post, I just got a 97 F350 Dump Truck and I am looking to get her to breath better. What method is better of the 2 I have listed?

Complete Cold Air Intake System with a new pipe and cone filter?

or

Just replace what's there with a K&N filter?

I only want to spend the extra money on the Cold Air setup if I get a good performance upgrade and or fuel mileage increase. Tell me what I can expect. Thanks.

 

Niether, get a good quality drop in filter for the stock airbox and then remove the air horns in the intake tubes if they still exist.