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      01-11-2010, 10:49 AM   #8
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The E9x models will continue to use the N54 engine, in a higher state of tune taken from the Z4 sDrive35i.

The N55 engine will be used in new platforms only as it requires a considerable change to the ancillary hardware and mounting components, which would be too costly to implement in a car that is in reality coming towards the end of its life cycle.

Furthermore, the N55 engine will prove more difficult to modify, given the implementation of Valvetronic, the fact the turbo is now a dual-scroll single-unit as opposed to a true twin-turbo setup, and also the fact that the ECU is half moulded into the intake housing, thereby making modifications to the intake system exceptionally difficult.
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