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      11-09-2012, 05:16 PM   #8
Vector Pilot
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Drives: 2014 Z4 28i
Join Date: Dec 2006
Location: Chicago Metro

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I have a Z4 with a N54 and E92 335i with a N55. The N54 performs best at speeds driving 90-100 mph+, but as daily driver the N55 performs far better in all driving situations including taking it up to 145+ on the Autobahn.