You can use this plug to remove the relieve valve and reroute your return lines to gain room for aftermarket Y-bridges.
http://dirtyhookerdiesel.com/i-14902634-dhd-007-1267-lb7-duramax-fuel-pressure-relief-valve-plug.html
These are the ones I have, but they do make other sizes.
http://m.ebay.com/itm/HERCO-Solid-Rubber-Trailer-Bumper-16-x-2-1-2-x-2-1-8-in-/261181337687?nav=SEARCH
Fingers vanes, 10 blade turbine and Wetzel wheel for now. Its probably going to be a month before I get it installed, have to get my pull truck finished up first!