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I predict that the majority of the n54 engines will live a long life and go to the junk yard without ever having the engine cracked open, or the turbos touched.
Just one man's opinion. Nothing factual to back it up with, other than running chipped for 70K+ of the last 100K+ miles on my turbo engine. I expect a BMW to do at least as well.
EDIT: Oh yea, I forgot to talk about the tiny size and light weight of the n54 turbos making them less likely to frag themselves into little pieces than big turbos. I'd throw around some spiffy engineering terms like "Moment of Inertia" or "Axial Acceleration" or something like that -- if I knew what all that stuff means.
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