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      01-24-2010, 12:54 PM   #2
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Drives: 335 E90 ZSP+
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The differences between the N55 and N54 in the 535i are determined by software specs, not inherent differences in the performance potential of the bi-turbo (N54) versus twin-scroll+valvetronic (N55) designs.

Believe me, there are variants of the N55 in R&D that smoke the current N54 & N54B30.
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