i bought the 35$ but i don’t have the v 6 10 12 16 i only have 25$ options why ?
Because the game is still in development, these engine configurations will be added when they are done 
maybe (under development)needs to be added to the home screen, ive seen so many similar questions asked.
I don’t think that will help considering that people don’t even read any text about the product (preorder) when they buy it. :S