I've been a Michelin loyalist for over a decade, but for the first time ever I would actually opt for something other than their Pilot Sport line. For the $ difference, ECS wins hands down especially for street use. If you're driving hard enough to need better tires (on the street or track), then you probably wouldn't be looking at either of these to begin with.
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'16 M3 | '23 718 Spyder
Past: E92 M3, F87 M2, E39 M5, etc
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