If I had to make a wild-*** guess, you'd want to stop around 500whp. Going too much higher sounds sketchy to me with the fuel system you described. The good news is that you should be able to make a ****-ton more power down the line with a bigger pump/injectors/fuel return system.
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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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