BMW chose to release the M5 using a slow cascade of bite-sized bits of information, which serve to continuously renew its name in the headlines and leave us wondering what else is left to learn. We know just about everything there is to know about the big bad Bavarian bruiser—the powertrain that’s responsible for pumping out 600 horsepower, the sophisticated all-wheel drive system that brings the model up to the level of its arch-AMG rival—but we don’t know what’s most important.
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