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I recently maxed out the oem mk4 pump at 500 rwhp, and I need to upgrade. Too bad the search isnt working here. I am looking to make 550-650 max rwhp. Now I was going to do the twin in tank walbros, but unsure what to do for the lines. I was going to get a second oem feed line to run to the front and feed one on each of the ends of my custom top feed rail, and use a single return line. Will the single stock return line flow enough for the twin feed lines?. Would a Y right at the pumps be the best way and then run a single -8 line to the rail, then stock return line?, opinions?