What does X4 M mean?
What does X4 M mean? The X4 (reviewed separately) is the midsizer of the group, and — like the larger X6 — it’s available in a high-performance M model. This X4 M is not for the faint of heart, taking the base X4’s 248-horsepower turbocharged four-cylinder and replacing it with a 503-horsepower twin-turbo straight-six. The […]
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