For what? For NA use (not running E85), an aftermarket pump is a waste. I'm pretty sure that a Walbro 255 would work just fine, but there's nothing to be gained by upgrading. For FI use, it all depends on the rest of the fuel setup - injectors, rails, return, etc.
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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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