Yes mine is functional, i installed the Cervinis under hood funnel scoop to the air box. The air coming in is extremely cooler than anywhere else. Which we all know cooler air is more dense air, meaning it is more potent per air molecule. My scoops are about a big as your hand. So as a test, to see how much it creates, roll the window down and slip your hand behind your mirror. Then cup your hand slide it above it and feel the wind resistance at 30-40mph you'll notice it's very strong. Around 60-70mph it does make you firm up your arm. But to really imagine the difference here is to think of your hand behind the mirror as the air filter thats behind the fender as one of those fender cool air kits that are away from the engine heat. So when you slide your hand up you feel the air more and its even cooler than behind something. But i'll say this about mine. When I'm getting on it, I feel a boost of some sort around 60-80mph and when it's already cool outside it really screams. I also believe a carb open element scoop would be the same at getting that cool air.