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The BMW 4-Series recently took the place of the previous 3-Series coupe, and now, it has its high-performance M variant: the new 2015 BMW M4. What makes the new M4 special enough to deserve the vaunted M badge? Many, many things, but foremost among them is a new, potent twin-turbocharged engine. Stylistically, the new BMW M4 offers the...
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