I dont think it could hurt. While the ATX has different harmonics, the problem area is the front of the engine, where the distance from the firing cylinder (#1) to the flywheel(or torque converter) is the greatest. So on the face of it, it would have, but may not be a dramatic as the MTX setup. Secondly, reducing the vibration means the drive train is subject to less vibration (Less wear and Tear). This can only help all in all. So i would say the DMD is a good idea for any application.
While this discussion was focusing on the bearing failure aspect, reducing NVH is always pleasant.
If you are inclined to put a DMD on, the ATX application is O.K. (in my opinion, of course).
