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The SD turbo is a downgrade if going stock for stock also to make a 99-03 turbo work in our trucks you need turbo, up-pipes, exhaust collector, pedestal, down pipe, and some how you have to adapt the y-pipe or add an inter cooler and adapt the intake plenum.
if he's planning to do mods later (most specifically fuel add-ons) there are a few HX50's on ebay. need fuel to spool though!
I saw that after reading tim's post somewhere else about his HX50 for 165 bucks on ebay... I'll definately keep that in mind!