If you want firmer rear support on your TRF421, the Tamiya 9803484 Rear Damper Stay Mount is a straightforward upgrade. It is built to improve chassis balance and help drivers maintain better traction through long corners.
The design adds rear-end rigidity that aids precision driving and repeatable setup tweaks. Its solid fabrication keeps performance predictable lap after lap, which is useful when refining suspension and anti-roll settings.
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