CFM is supposedly investigating making them. This time they will not come apart. Normally I would say do not install one on a duratec, but if you follow their detailed instructions (something I don't believe focus central included with their pulley setup) you should be okay.
In any event, it would still be a good idea to really think about this...cause if you mess it up your engine goes bye bye.
Just so you know: If CFM makes one, I will buy it.
if your car is a daily driver, its not worth it to get a pulley. it slows everything down alittle close to the "too much" side, better to save your money and get cams or a tune something to add power rather than "free" it up.
u cant find the kit for the duratec because they dont make them and they dont make thim because so far everyone that has tried has like aero sayed nuked the motor. there still inder R&D until thwy can get them to work and not brake everyting all to hell