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Dual Mode Damper
A replacement for the crankshaft pulley, the DMD dampens harmonic vibrations at two specific frequencies. Many claim this will decrease harmful "crank whip" which bends the crank out of shape and can possibly spin the rod end bearings.
Above 4000 RPM, the stock duratec crank damper inadequately absorbs harmonics generated by the crankshaft. Duratec experts have cited that excessive harmonics and "crank whip" could cause the excessive "crank-whip" and spin the rod bearing. A spun beraing means engine rebuild or replacement.

Luckily, Ford produces a Dual Mode Damper that better absorbs harmonics above 4000 RPM. The "DMD" is different because it has a second damper ring pressed onto it's face that kick's in above 4000 RPM, hence "dual modes." People who have installed this damper on their V6 Contour, Mystique or Cougar have reported an engine that feels smoother and more refined.