we went from 24:1 to 16:1 (manual) in the stock car & it was a night & day improvement, before it was hand over hand in the corners to turn it. In a 1/4 mile drag car I would think there'd be minimal turning in that pretty much strait line 1/4 mile stretch but I ain't a drag racer so I am just thinking out loud (FWIW). As said I would set in/test drive one that had the 16:1 & see what you think before you invest your time/$$$.