The airbox may have been changed out if the truck was in for a driveablility problem. There was a TSB on it, that is why mine was the later model when I bought my early 99. Ignore the rating on the valve cover, that number only applies to the engine in International trucks, Ford modifies the PCM programming, and it does not have to comply with the engine sticker.
As for the turbo, it is most likely the early 99. If you do not have the AIH in the manifold Y-pipe, you have an early 99. The Y-pipe will not interchange between early & late 99 turbo's. Also, to upgrade to the late model turbo, there are many other parts that have to be changed out, approx $800 for all the parts.
As for the turbo, it is most likely the early 99. If you do not have the AIH in the manifold Y-pipe, you have an early 99. The Y-pipe will not interchange between early & late 99 turbo's. Also, to upgrade to the late model turbo, there are many other parts that have to be changed out, approx $800 for all the parts.
