Porsche is testing its fans’ brand loyalty with sky-high 911 prices—many competitors offer more power for less money.

There's a six-and-a-half-year-old boy in Atlanta, Georgia, who is one of the luckiest kids in the world. He gets to play with this, a 1984 Porsche 911 with a GM LS6 small-block V-8 packed in the trunk ...