Darthsyn - Shoggy helped me with this earlier this year. I looped in a Liang pump - it works fine. There is a kit:
http://shop.aquacomputer.de/product_info…roducts_id=2483
I bought the DCC pump and poweramp, looped it in with high flow quick disconnects to the outlet of the MkIV. In my case the the base of the MkIV is about 1 meter below the first cooling block... went from 40 l/h to 60-70 l/h with the DCC at 9.2V. For me, the main purpose was to put a backup/redundancy into the system.