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      02-02-2013, 08:14 AM   #20
Brigadier General

Drives: anything given a chance
Join Date: Jul 2008
Location: .au

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Originally Posted by claykin View Post
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.
The N54 also uses forged pistons, not cast ones, among some other things I can't recall this late at night. If you were going to go nuts out and tune your car significantly, I'd pick an N54 engine over the N55.

OP -If you're just a daily driver with ambition, it's not going to matter to you.