XRAY 301078-K X4 Glass Fiber Split Rear Upper Deck - Low Grip Tune  [XR-301078-K]

Glass Fiber Upper Deck for XRAY X4 Handling

The XRAY 301078-K glass fiber upper deck is a practical upgrade for improving handling on low to medium grip tracks. Made from 1.5mm glass fiber, it adds controlled flexibility to the chassis, helping increase traction and refine steering feedback.

Two Flex Positions for Tuning

This upper deck gives two flex settings so tuners can tailor handling to the surface:

• Soft Setting: Fit only the rear central screw to maximise flex and boost turn-in and steering feel, though the car can feel less stable when applying full power.
• Stiff Setting: Use both rear screws to reduce flex, improving straightline stability and predictability while slightly reducing mid-corner rotation and steering bite.