How much extra weight will this add to your vehicle?

And to put it in perspective, how does this compare with loading the car with passengers and luggage (to which the car is qualified to handle)? I think you can see where I'm going with this.

I like neanderthal's suggestion of matching the brakes to the 500E, especially if the weight distribution is similar.

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95 E320 Cabriolet, 169K