I am not into putting on performance parts that just look good because then they should not be called performance parts.....they better doing something to increase performance.

Having outside cool air is going to help with more denser air going into the combustion chambers. Like I mentioned before, having them elevated is better,
but having cooler air is 2nd best, it is just not forced in as hard.

Many cars make a wooshing sound with functional hood scoops as the air is being forced in but with the flaps closed it will be quieter as a daily driver....until you punch it.