If absolute power corrupts absolutely, I'm guilty.

I was moving rapidly in a recent test of the top-line, 300-horsepower, twin-turbocharged BMW Z4 retractable hardtop. Good luck finding the limits of this car on city streets. The faster it goes, the more in control it feels.

At high rpms, the 3-liter, straight-six engine has the blare of a track racer. It challenges the Porsche Boxster for intoxicating engine sounds and exhaust note.

The seven-speed, double-clutch, automa ...

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