Plymouth made several as well as Dodge. NACA hood scoop on an AAR Cuda and the six-pack hood scoop on the 69 lift off fiberglass hood. Dodge super bee on the 69 with the lift off hood. T/A Challengers were nice also. But to get the full effect you needed to be 8" up above the hood to get a ram effect. Thats how they do it at the strip. Best bet on a street car is to go to the grill and pull air at a high pressure area.