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The N54 is very well-regarded for performance, and for how strong the basic engine is. It can easily be goosed up to near 500HP, with few worries about the internals hanging together. It is about the strongest engine BMW was ever built. But, as my BMW-dealer-mechanic family member told me just a few days ago, "the basic engine will run forever, but everything else will break". That has certainly been my experience over the last 7 years.
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