BMW is gradually replacing its N54 3.0-liter twin-turbocharged inline-six (featured in models like the 335i) with the firm's new twin-scroll turbocharged 3.0-liter inline six cylinder engine, designated N55. The latest Bavarian products to get the N55 are the 2011 model year 135i Coupe and Convertible that will go on sale in the United States in Spring 2010.
With a maximum output of 300HP at 5,800 rpm and a peak torque of 300 lb-ft available from 1,200–5,000rpm (U.S.-spec version), the new six-cylinder produces the same level of performance as the current twin-turbo six-cylinder.
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