mileage and power - 5.4 2003

[01exp4x4]

5.4 mileage and power GUESSES??

What mileage increase could I see from
KN intake and a Cat Back Gibson exhaust?


Had 17 mpg on my drive from Cali to Nashville.

 

[Hamfisted]

None ...

 

[01exp4x4]

I doubt that.

Both modifications have better flow...

Somebody has a KN cold air and a Gibson
or similar cat back exhaust with results to share.

Any body?

Anybody change over and see better mileage?