[Jackpine]

Paul, I think with the intake, you definitely want custom tunes.

I know Bill can delay the upshifts while you're towing, if that's what you want, in a custom tune, so a custom tow tune is probably indicated.

If you are in the habit of changing the octane rating of the gas you use, you'd want a tune for each octane rating. There aren't enough tune positions for everything of course and I honestly don't see you switching back and forth between 87, 89 and 91 octane either. It all comes down to what you intend to use. If you like the 91 and that's all you put in, then I'd get two tunes set up for it: the tow tune and a different "mileage" tune for when you're not towing. That's what I have, except mine use 87 octane E10 gas for both.

I think if you go on trips much, the "pure gas" 91 octane stuff may be hard to find along the way, so I'd actually favor 87, which is what our trucks were designed to burn anyway.

Can Bill improve your gas mileage? He did mine, about 0.5 MPG over what the canned tunes gave me. I can't promise what custom tunes would do for you though.

One thing I'd worry about is the CAI. 04 and 05 trucks came from the factory tuned pretty lean to begin with and CAIs have the reputation of making things leaner, which can lead to engine damage. Bill's custom tunes will fix that.

Hope these thoughts help.

- Jack