Specifically for Opterons meaning a dually system? You can get performance as good/better from the Danger Den TDX and #4 nozzle, but only at high flow rates. It is going to be difficult to get 2GPM through 2 TDX w/ #4 nozzle I fear. The performance curve for the MCW600x blocks is a lot flatter; they likely would be a bit better in series.
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