Quote:
Originally Posted by bimmerjph
... The Z4 35i uses the N55, and the Z4 35is uses a slightly tuned N54.
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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.