K&N Cold Air Intake Kit: High Performance, Guaranteed to Increase Horsepower: 2011-2016 Ford Super Duty (F250, F350, F450 F550) 6.7L V8 Diesel, 71-2582

Very easy to install and gives the truck a better sound - with 440 horsepower and 860 lb-ft under the hood stock it is difficult to tell a difference in power with the addition of this unit, though based on the power curves for the 2012 Ford 6.7 I would expect a 2015 to be somewhere around 455 peak horsepower and close to 900 lb-ft of torque at the crankshaft with this intake.

Had no problem installing this kit. I noticed the truck is a lot more snappier on the throttle. I have noticed a small fuel mileage increase as well. The engine sounded a bit more throatier too, but not so much as to make me dislike the extra noise. One issue I had with the kit which took me a month to realize - There is a small diameter steel line dead head with a black plastic cap (not sure what part of the engine this is connected to) that sticks up and touches the metal K&N enclosure. I''d park my truck and hear this horrible vibrating noise. After opening the hood, I realized it was the dead head pipe, and bent the K&N filter housing just slightly out of the way. I am also tempted to bend the dead head, but am worried about breaking it.