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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.
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My trucks production date is 7/98(early 99). It does have the AIH on the y-pipe also. I'll have to check the bolts on the turbo. And how does that explain th e valve covers I have seen with 235HP, 225HP, and 215HP ratings? I know the 215 is from REAL early '99's that still had the non-intercooled PSD in it. It was like they attached the new body to the old engine and chassis.
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.
[/ QUOTE ]
My trucks production date is 7/98(early 99). It does have the AIH on the y-pipe also. I'll have to check the bolts on the turbo. And how does that explain th e valve covers I have seen with 235HP, 225HP, and 215HP ratings? I know the 215 is from REAL early '99's that still had the non-intercooled PSD in it. It was like they attached the new body to the old engine and chassis.
