Most cars add weight with redesigns because the companies make them larger. There are still many Japanese cars that stayed the same weight or lost weight from one model year to the next, so the Z doesn't have to put on weight.
Also, the Genesis already has more than 300hp. It could stand to lose weight, but it isn't really aimed at the Z, it's marched better with the piggy Gs.
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2009 370Z Touring with Sport
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