Does this make sense to anyone? Are there '06s from the factory that don't have a cat. I bought it as an '06 from a less than honest place that sells rebuildables. They cooked the computer trying to jump start it in their yard. I trailered it home ordered and installed a used 06 computer for it. It runs and drives fine with no CEL. Bottom line is I'm wondering if they put an earlier model drive train and frame under an 06 cab. I'm not sure if the computer would have a significant impact rolling back to an earlier drivetrain. Could it be from Canada? Any Ideas? The no cat thing has got me confused and I'd like to make sure the drivetrain/frame is actually an '06.