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Originally Posted by Wiles
You are miss informed!
All Z4 E89 3.5i and 3.5is have the True Twin Turbo N54, not just the 35is.
I think part of the confusing is BMW marketing speak "twinpower". This is the marketing name for both the Twin Turbo (N54) and Twin Scroll single Turbo (N55) motors.
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Oh. I thought they had completely phased out the regular N54. My bad.