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I hate to compare them but Supra's are equally heavy. They overcome the weight disadvantage by pushing more hp. With 20G's you'll make plenty of power. The weight savings you have done already are about as extreme as you can get. Here in Japan the serious auto-X companies will have fiberglass or CF doors and panels. There is a fiberglass rear hatch made for the Z here but it looks like a MR2 rear. They also cut thousands of small circular holes in every metal panel they can.
Z from Japan Parts For Sale... Click me! 

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