Are you sure? Usually plastic has a much lower thermal conductivity than Al, so the long tubes would transfer more of the engine bay heat to the air within the tube. Granted, I'm not sure what type of plastic the stock intake tract is. I think the best case for an intake would be a long tube setup with the reflective gold foil wrapped around the pipe, but the way the factory intake is set up is pretty good for an OEM.
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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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