thanks Eddie S '04.. since I posted this I have found a place within a couple of hours of me that has both. They have a SCT XCaliber III for a Sport Trac and they will program it for you and dyno it. K&N says they do not have a cold air intake for a Sport Trac but the 77 series will bolt up. K&N didn't "produce" it for the Sport Trac therefore they will not warranty it which is crap!
Tommy, they produced the 77 for the explorer. Same under the hood. They never certified it. I wouldnt worry. Just check it for flaws before the install. You will never need the warranty on K&N products.
If you have the dyno with the sct. You will get the best tune. Our sponsor, Torrie has written some good tunes though.