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Should you end up behind a BMW 3-series or 5-series sedan with “35i” concluding its model designation, you’d expect to find the same twin-turbo inline six under the hood. And you’d be right to do so; after all, that excellent engine has gained much fame powering both these vehicles. But, …

To the uninitiated, BMW’s M-division may represent the ultimate in BMW performance. But, long before M ever existed, BMW used a different collection of letters to designate their top performance model: CSL. Perhaps best represented by the old 3.0 CSL of racing fame, the letters designated only the most potent …