I have a 4x4 expy with 5.4L getting good MPG now. Going to get a K&N FIPK, Gibson and a superchip wanting to know A)what the airflow sensor does? and B)would a better sensor help MPG?

 

which Gibson are you going to get??

I'm stuck between the Swept Side and Dual Sport Truck..

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'99 Ford F-150 Lariat Supercab 4x4 ORP
5.4L Triton V-8
Deep Wedgewood Blue



MODS TO COME:
K&N FIPK
Gibson Swept Side Exhaust
A.R.E. LSII Hard Tonneau Cover

 

To be perfectly honest that is the same descion I am going to be making. I like the way the Swept sounds buthte looks of hte dual on my EXPY would be great.