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      09-09-2012, 07:27 PM   #2
Jeff@TopGearSolutions
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Drives: C6 Z06, GSXR-750, 09 335i
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How much power are you looking to make?

The N54 has a lot more options as far as tuning, and modifications.

The N55 does not have an upgraded turbo options yet, while the N54 does.

In my personal opinion, I would seek out an N54, without hesitation.