We'll admit, it feels like a typo whenever we write "4 Series," but if BMW is as insistent upon further breaking out its coupes and convertibles from its sedan ranges as we've been hearing, we'll just have to get used to it. The BMW 4 Series is expected to officially kick off when the two-door versions of the new 3 Series are launched, and our spies recently caught a prototype of the new droptop 4 testing in the rain.
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