The N55 has 1 Variable Turbo, being dubbed the Twin-Power, because of it's Duel Function.
The N54 [Twin-Turbo] will be replaced by the N55 [SINGLE Twin-Power TURBO] because of the fuel saving it is capable of.
The new series of High-Revving Turbo 4 Bangers, most likely will see the same Twin-Power Single Turbo application.
The 2011 X3 being built on the up and coming 2012 3er Platform, may indeed see the first application of the new N55 Motor.
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