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N54 more tuner friendly
N55 more reliable.
you pick what you need more.
people say the N55 has less turbo lag, and that the n54 feels like a "bigger" engine due to the twin turbos, but i think this is subjective to how the engine was broken in during the early stages of its life. eg. a well sealed turbo engine burning no oil will have less lag and feel more responsive.
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