SPICIER CAYENNE SIZZLES; The world's fastest SUV has gotten faster-and much more powerful, too!(News)

Byline: GREG KABLE Under pressure from Mercedes-Benz's 6.3-liter 510-hp V8-powered ML63 AMG revealed at last September's Frankfurt motor show, Porsche unleashed a new range-topping Cayenne Turbo S version the company claims out-accelerates its own new sports car, the Cayman S, from a standstill to 62 mph.

Unveiled at the Los Angeles show, this four-wheel-driver runs a more powerful version of the Cayenne Turbo's twin-turbocharged 4.5-liter V8 engine, putting out 521 hp at 5500 rpm and 531 lb-ft of torque between 2750 and 3750 rpm. That is a 71-hp and 71- lb-ft improvement on ...

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