so the radio interference plugs are in fact resistance plugs.
Nice trick up Mercedes sleeve and bad advice at that.
I changed back to the non R plugs tonight and just took her out for a spin. No loss in performance at all so IŽll leave them in nice and quiet.
I do not have an Ohm reader but I do visit people that probably do. IŽll leave on of the R plugs in my car ( the trunk that is) and try a reading when I can.
Thanks for all the info,