The idea is to create an area of positive pressure feeding the engine. Having an area inside the scoop, sealed to the carb without a lot of turbulence, is the trick. I'm not an aerodynamic expert, and I haven't hired one. But I do try to pay attention to what the guys who have are doing. If you think turbulence is an issue, experimenting with air cleaners, stub stacks or some other way of straightening the airflow may pay off.