I know that the tone ring mod advances timing just a bit, so can one consider the tone ring mod to be a "poor mans" Rokktech or Smarty? I have been considering the tone ring mod, it seems like a pretty easy and cheap mod, but obviously, I am a little hesitant to tear apart an engine on a $30k+ truck and start grinding away on zero-tolerance parts. From posts that I have read, it sounds as if the 4 bolts and tone ring are actually an external part? How about the dowel pin? Any info would be appreciated.