For a really good answer I'd reach out to Phunk. He seems to be the guy for fuel systems. I stopped researching the fuel return when everything I found made it seem like it was unnecessary under 600whp or so.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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