A smiling A.J. Burnett has put the Yankees in his rear view mirror. The pie thrower is thrilled to be a Pie-rate. "It's a fresh start,'' Burnett told The Post yesterday of pitching for Pittsburgh, his first interview since the trade talks began. "They've got a young, good team here and coming on back to the National League, it's going to be fun again. I'm also looking forward to getting back to where the game is fun.'' In New York, the game is fun when you win the World Series, something Burnett and the Yankees did in 2009. Burnett, 35, had many struggles with the Yankees, compiling a 34-35 record, but he does not have any regrets about being traded to a bottom-rung team in the NL Central.