im currently using the 75a, and the vibration is pretty noticeable already. i can't imagine DD a car with anything higher.
How about video clips of people's cars idling with the various grades to compare the vibrations?
I'm glad they're holding out. I just ordered these a couple of days ago (75a).
Chris, Can you enlighten me regarding that longer bolt that is needed ? is it for the front or rear mount ?
Thnx bud. Hope life is good!