Fender well intakes and true cold air intakes keep the temperatures down compared to an open cone. I believe w-body store or zzp, someone tested the different in intake air temps and open cones run about 70 degrees hotter than something that's sealed off away from the heat. Add that to your supercharger heat and you're creating knock, maybe to the point where it's not helping at all as far as performance but just to your ear!![]()