You are exactly right Jayson.I too had the head removed from my old red top eccs Rb20det-r and it looks exactly the same as your picture(12 ports),even though it had the 6 runners on the plenum.Cheapest power upgrade for top end power has to be to remove the butterflies.Shit job though.
Does someone have a picture of a silver top Rb20 head,i would like to see the difference.