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      01-22-2013, 11:02 PM   #13
claykin
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Drives: 2016 535i M-Sport
Join Date: Nov 2009
Location: Florida

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The N55 is only as reliable as the one BMW built for you. And how well you take care of it.

Overall the N54 is a more complicated design. It also has some higher end components such as the piezo injectors and true dual turbos. N55 is what most would consider a cost reduced version of the N54.