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I'm trying to install a vortech fmu someone told me this goes on the return side of the fuel rail our car's don't have a return side how are hooking this up I also have the rsx-s injectors.PLEASE HELP

 
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search return fuel system, you will find info, i have a few pictures below on my web site

 
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I wouldn't run the fmu. Run an adjustable, rising rate fuel pressure regulator.
^His return setup basically shows how its done. I would definitely install a walbro 255lph pump in place of the stock one as well. Running a return line off of the rail is not necesarry tough. All you need to really do is put a T in the feed line before the fuel rail and run one side to the rail and the other to the regulator. Then run the return line from the regulator back to the tank.

 
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you can also loop the FMU as to make it seem like its returning fuel. your best bet running one is to use a cartech so you can adjust ratio

 
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Splice it in b/n the fuel line coming from the firewall to the fuel rail.