Recently, rumors have been suggesting that BMW is cooking up a new limited-run M4 CSL. In case that just sounds like Greek to you, here’s why that’s cool: the M4 — the coupe version of the M3 — is the BMW that perhaps best lives up to the brand’s ultimate driver’s car tagline; meanwhile, “CSL” stands for Coupé Sport Leichtbau; Leichtbau stands for lightweight in German. BMW has only used the designation twice before.
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