Terry, are these the symptoms and problems that the DMD is supposed to alleviate or help with? I have a 'ticking' sound for the longest time now and was told it was my fuel injectors firing. The 'problem' hasnt changed sound or frequecy since day one. I do want to prevent the knocking sound you speak of, which is why I am seriously looking into picking one up from a group buy (as soon as I find another job!) Thanks for the help... -Nick