I'm not quite certain because of the new forms but I'm thinking you'll order the 04-08 gryphon but make sure you designate it is for an Expedition. It would probably be best to call to make sure you get the right stuff.
There is just one issue for your custom tune question. The performance tunes aren't rated to tow more than 2500 pounds because they are intended for improved performance of an unloaded vehicle. You also wont have a huge increase in mileage, maybe 1 or 2 mpgs. The largest factor is your own foot and vehicle condition. As for towing, the canned tunes include a tow tune that works quite nicely. You can just reprogram to that when you plan on towing.
When you order your tune/programmer, you will get the programmer first with canned tunes. You will use the programmer to retrieve your HEX code and submit it through the web site. Once the tunes are written they will send you an email.
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