My answer to that would be, "How do you figure?"
I can only assume that you think that double the air means double the speed. If that's not what you think please explain.
Now, since the air is twice as dense, if speed doubled wouldn't total airflow be mathematically squared?
Lets assume an engine flows 1000 cfm at a specific rpm and load point. If the air density alone is doubled, the engine would flow 2000 cfm.(or would it?)Now, double the speed of that "twice as dense" air. That would come to 4000 cfm. Does anyone think that 15psi boost would increase airflow by a factor of 4? How about 3? How about even 2? The fact is density creates friction. Even a straight port will slow air speed with increased density.