Each of the X4's trims has its own turbocharged engine. The 28i features a 240-horsepower four-cylinder, and the M40i comes with a 355-horsepower six-cylinder. The base engine has plenty of power ...

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The 28i hits 60 mph in 5.7 seconds and clears the ... If all the X2 does is whet its owner's appetite for an X4, it's probably accomplished exactly what it was designed to do.