Some vehicles i wish was in the game

Why newer camaros is not in the game like the new zl1 1lE and why is 1993 chevy silverado not in the game I think it would work as a good racing truck with its body style I have a 1993 chevy silverado and I love it but I would love to have a camaro zl1 1le and a 1993 chevy silverado in the game