The early 99s had a "Wicked wheel" installed from the factory, smaller compressor housing. Different exhaust housing I believe too. Up-pipes are different, collector is different, Intake plenums are different, intake "Y" is different. (where the intercooler tubes hook to) of course the intake plenum boots are different.
Here are a couple of pictures of some of the items...
in this picture UNDERSTAND this is a later model VAN turbo, thus the different exhaust housings, BUT the huge difference in the compressor outlet is apparent. That is why you need the different "Y" of course.
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