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You are all forgetting, the biggest advantage that the N55 will have over the N54 is not the turbocharger, it's the VALVETRONIC.
Take the perfect valve lift and cam timing and factor that into the equation at every RPM and you have an OPTIMUM design. The turbos are the least of our worries, whats the turbo gonna do? Just boost air pressure, been there done that with the N54.
The valvetronic is the winner in all this, forget about the turbos already.
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2009 - Titanium Silver - Steptronic - 135i - Nasty 
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