I used slapper bars on my 440 4 spd '70 Challenger, what night and day difference in wheel hop and spin. Like JBC426 said they need to be properly set up so they function correctly.
One of the two wiiningest mopars in my memory , was a duster w/ slapper bars on it , of course about every other mopar racer made a joke about it ,
---till they came up against him !
He eventually got tired of winning and quit ------------
