BMW used every tool at its disposal to transform the M2 CS into a sports car. But is it as good as Porsche’s six-cylinder Cayman GTS?

If you’ve ever used a wrench in place of a hammer, you’ll understand what the BMW M2 is about. Engineers took an aging upright compact coupe that normally rides on run-flat all-season tires and transformed it into a great-driving car. 
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