Hello...I am the guy that started that thread awhile back on LS1.COM. All I can say is we have documented well over 6 million miles in our volunteers automobiles since I began this experiment.
To date not one negative. So many postives from quiter fuel pumps to MPG increases to quieter valve assembly.
I do not defend nor sale anything. I just set it up and documented all of it.
I am now doing the same thing on MMO.