WE are not taking race cars here. Show me a picture of a stock diesel truck are car with a hood scoop. What happens with and on a race motor is completely different in varying degrees than on a stock car. Could you show me where a discussion about fuel efficiency went to race cars and motor.
The scoop is a factory item behind the grill on a chevy2500, go look next time you are at wallyworld.
They can be cleaned up so they work properly. NOT a race car.