FOR FULL ARTICLE: www.edmunds.com Brute force, a quality we can’t help but assign to any car generating 638 horsepower, is by definition anything but subtle. Yet the 2009 Chevy Corvette ZR1 manages at once to be both brutally quick and remarkably mild-mannered. Its quarter-mile acceleration is quicker than any production car we’ve ever tested, its chassis is benign but highly capable and its carbon-ceramic brakes are mind-bending in their effectiveness. This new Vette offers an unlikely …