I have to believe unless the engine sets really high the lexan scoop would be the best. It's out of the boundry layer. Make it only as big as needed. As mentioned a fast car doesn't need much. It doesn't obstruct vision. As Casey and I can a test the scoops we are forced to use are huge air catchers. I've also tested sealed and unsealed. Sealed beyound the 1/8 is worth a fair amount on my car. About .05 and over 2 mph.
Doug