I could not tell you what each does other than their descriptions. There is no one way to assemble one of these 2004r. Every builder has their own "secret receipe". Depending on who you are getting your advice/parts from is who I would listen to. I have instructions for a bunch of kits. They are on the net or I can pm you some links if you like. Lots of different ways to do things. The springs, balls, hole sizes, blocked orfices all are interdependent. One change can make big things happen or nothing happen differently depending on what is changed. This is why many like to start with the brf vb/gov combo as it gets you "in the ballpark" without much work.
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