Yea, more than likely it would be pointless to use a small turbo with a larger motor. However, I don't feel that they are building the all three of those cars "around" the turbo. Even though you could be correct I would assume you would start with a motor and then choose parts that would complement it. Yet this also brings up the idea that these cars are not built specifically for track use. They are intended for durability i.e. daily driving.