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R32's do have ceramic exhaust wheels on the turbos. They are time bombs. As in, it's not a question of "if" they die, but "when" are they going to die. You can accelerate their death by running more than 1 bar of boost. And you don't have to worry about starving the head of oil, as mentionned above, it's the opposite, oil will pool up in the head and you'll starve the bottom end. You just need to get oil restrictors from Tomei (pretty cheap, search online) to restrict the amount of oil making it up there.
As mentionned above, the oil pump drive on the earlier R32 motors is junk, bounce of rev limiter one too many times and you sheer the oil pump drive out of thee oil pump. I think that R32 motors built after August 1993 have the revised oil pump drive.
There are a couple more differences, but none that really matter.
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