For the 2011 model year, BMW has moved from a true twin-turbo setup to a twin-scroll single turbo for the 3.0-liter engine's forced induction. Power output remains the same--an even 300-horsepower--but fuel economy is up from 17/26 to 19/28 mpg.
July 21, 2010 1:13 PM PDT
Photo by: Josh P. Miller/CNET
| Caption by: Antuan Goodwin
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