Some good points made. My use of them has been on daily street driven cars with mild motor mods, cams, headers ect. Not cars that see the upper RPM's all time time. My reasons for using them was for more low rpm,s such as idling for 15 min in a drive through. Not WOT all the time. Sure they see a few burnouts and WOT for a few sec on the highway but not for a living.