well 2 360's would defo handle the heat and yes a stronger pump will be needed. I myself have never tried sandwiching two rads together I would imagine the heat from one would elevate the heat in the other making it not viable. plus not to mention the real estate that would take up. If your not concerned about it being in the case Tom linked a rad that was external mounted and iirc could handle 9 120mm fans I'll see if I can find the link 4 ya