The YZ-003SG is a compact 2.0mm graphite shim positioned between the rear bulk and upper deck on Works'91 TeamSpec chassis to increase local stiffness and refine rear behaviour.
Mounting is direct and conservative: the shim is sandwiched between the rear bulk and deck stack and secured with the stock deck fasteners, leaving suspension geometry unchanged. Because it tweaks local rigidity rather than layout, expect altered bite and transient response rather than changes to ride height or travel.
Choose this spacer for a durable, reversible tweak to rear stiffness when you want to reduce flex on firm surfaces or make the car feel more immediate in quick direction changes.
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