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Well, depending on what kind of 18s you get, you'll accelerate slower because of the increased weight, and the distance of that weight to the center of the rim. Since the majority of the increased weight is located far away from the center of the rim, the weight is further emphasized, meaning your car will have a harder time accelerating. This is why even if you get 18" rims and tires the same weight as stock, you'll still accelerate slower. I noticed this when I got my 17s, and with tires they were only 3 lbs heavier than stock.
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