With the recir mod I did the feed mod using a MJ1200 on my G3.
Mainly because easier and cheaper (gate valves) than cutting into one of my 2" drains and trying to balance flow, partly that I seen the G3 rated to a max of 300gph (~ same as MJ I had laying around) and though once suggested/recommended by asmskimmer.com, they seem to be backing away from direct feed.
http://www.asmskimmer.com/phpBB2/vie...ht=direct+feed