Some people say they're useless, but I say they're not makin enough power. I had a friend years ago who had a 74 Challenger with a really nasty 440 and all the goodies everywhere. That car had a snubber, but after the first few passes, we noticed it was pounding the floor pan up where the snubber was hitting. He took the car back to the shop and made a pinion snubber cross member out of 1/4" plate. It didn't do that chit anymore. That was a badass car, too.