Stewart set for final race at Sonoma

(AP Photo/Carlos Osorio)

SONOMA, Calif. (AP) There was a twinge of nostalgia in Tony Stewart's voice as he was inducted into the Sonoma Raceway Wall of Fame.

Then his mood quickly turned as he talked about the reasons he's retiring from NASCAR competition at the end of the season.

"I'm ready to go run stuff that makes me happy, and driving a Sprint Cup car does not make me happy right now," the 45-year-old Stewart said Friday. "A lot of things have changed. The atmosphere has changed. There's so much stuff in the garage area that's changed that it was time for me to make a change with it.