2005 6.0 112000 miles, headstuds, sct, 5" exhaust, and CTS. Fuel pump started acting up and I don't want to kill the injectors. I know nothing about any of the aftermarket units. I plan to upgrade the turbo and injectors in the future so don't want to have to upgrade the fuel system again. I see an airdog and a Fass but which is better and what size. Do I need a new sump and do I need a regulated return any help is greatly appreciated.