This Factory Pro option upper deck is an RC-scale replacement part made for the XRAY T4-20 chassis. It functions as an alternate mounting and stiffness element in the car mid-section, aimed at racers and hobbyists tuning chassis balance and steering response.
The part fits into the stock upper-deck location and makes use of the existing factory mounting points on the T4-20, so no extra brackets are needed. Typical installation requires removing the original upper deck and moving the factory hardware to the option piece while keeping original screw positions and torque for consistent fitment.
From a setup perspective this upper deck works as a chassis rigidity lever: the Scythe Type option alters upper-deck behaviour and can change how the car moves weight through the chassis during cornering and on-throttle transitions. Use this component alongside shock adjustments, anti-roll tuning, and tyre selection when refining lap-to-lap performance.
Offered as a direct-fit option for XRAY T4-20 owners wanting a different upper-deck characteristic, evaluate changes in controlled test runs and combine this deck with suspension and tire changes to measure tuning effects.
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