you are going to think i'm nuts, but my wife likes my keyless go in the sl55 and was wondering about coverting to keyless go in her sl500. it this possible within reason? or i guess is should just wait for a while and get it on a newer car later. thanks

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2001 cl500 sold, 2001 ml430,2003 sl55 silver, pano

The retrofit would be astronomical. Figure at least $10k minimum.
New body harness, door hardware, modules, 5 antenneas,....
I would wait for a new car.
DR.D