| its not plug and play since they dont have adapters to fit the stock wire harness. You can either tap into stock wires or cut off the plug and use some kind of male/female plugs in case you need to replace the stock plug sometime in the future. There is no check bulb messeges because their ballasts have built in capacitors. I installed one of these on a CLK and it works good! I think the price is little too high, since you can buy cheaper kit and pair of capacitors and do it and you will have the same result.
Good Luck!
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~2004 Mercedes-Benz S430~Albaster White~13K Miles~Black Interior~Active Ventilated Front Seats~Chrome Headlight Surrounds~Chrome Mirror Covers~Chrome Door Handles~8000K HID | 
