When you were growing up, remember the two kids who thought they were the toughest in town and they always had to fight to see who was the best? Then we grew up and bought Corvettes. First, from 1990 to 1995, there was the ZR-1. And now the current "bad boy," the Z06, has come to the neighborhood.
    So here's what the Corvette world has been waiting for - a showdown between the LT5-powered ZR-1 and the new LS6-engined Z06, two of the toughest Corvettes ever produced. The outcome may surprise you.
    The ZR-1, which was quickly dubbed the "King of the Hill" by owners, was a limited-edition, rather expensive (at $60,000 plus), C4-based Corvette, available from 1990 to 1995 and built to be the world’s fastest production car at