I have both ATI and a real "Fluid Dampener" on stroker BB Mopars, both are excellent One thing you need to be careful on with the fluid type dampeners is the type of fluid in the dampener and the temperature you run the motor in There has been several incidences of Fluid Dampeners allegedly (on here ) of breaking crankshafts on motors revved up when the outside air temps where cold I have bought several ATI balancers since running one on my street car for the last 5 yrs,, they are the only ones I will run now Especially after "Fluid Dampenr Comp." went bankrupt several years ago