What CAI Are You Running?

[ChuckD]

Originally Posted by Power Hungry

So do I.

The CAI doesn't actually increase airflow into the engine, but more to the point it removes the restriction.

Think of it this way... Try breathing through 3 feet of garden hose. Under most circumstances, you'd probably be able to breath just fine, but exert yourself a little bit and suddenly that little bitty hose isn't going to cut it. You simply can't get enough air to meet the increased demand.

The stock airbox on the F150 is more than adequate to meet most airflow demands of the vehicle. The only place it falls short is the tapered end of the snorkel that is routed into the fender. It tapers down to about 75% of the size of the rest of the airbox. At low to moderate speeds it's not an obstruction, but as you get up over 3500 RPM under heavy throttle it starts to become an issue.

Most folks have found that by simply removing this piece you can see a noticeable increase in performance in mid to high RPMs, and best of all... it's free! That's my kind of price.

Hope this helps.

I did this on the Expy but instead of leaving it open I had a rubber bellow from some boat stuff in the garage. I put over the end and the other end fit up against the inner fender. Not quiet as snug as I would like but enough for it to work well. I am pondering on putting a 6637 in there and making my own tubing though.