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I'm not sure, but I would guess 40 pounds, give or take a pound or two. But you WILL notice a difference if you put them on your car. I just put 17" Bullitt's on my SN-95 3.8...and I felt quite a difference, I had 15"s before.
When I added my Cobra R's I immediately noticed a difference. The entire back end felt extremely heavy. I wouldnt reccomend getting 18's, unless you want your car to be all looks, which is basically what I've done to my car.