BMW M has a secret garage. We’ve been there once in 2011. Inside it: four prototypes that never made production — a V8 M3, a special V10 M5 and V10 M6, and a stripped-out M2. Each one was built, tested, and shelved. Each one could have been something. So which should have actually existed? The M5 CSL V10 is the crowd-pleaser argument — 630 horsepower, 8,750 rpm, 150 kilograms lighter than the standard car, a 7:50 Nürburgring lap that would have …
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