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This Brass Reinforcement makes the center of the chassis stiffer. This provides bending of the long center shaft. The flex of the chassis remains almost unchanged. It brings 20g more weight with a lower center of gravity.
The new S14-3 Carbon Fiber Wing Mount Spacer provides the rear wing mount a stronger support. With a bigger surface it makes the wing sit flat and provide more stability. Using double spacers will make the wing position higher thus providing more stability to the rear suspension but not reducing the rear corner speed.