Factory Pro O-XCP016 is a rear narrow split upper deck produced in Graphite 2.0 as an aftermarket upgrade for the Xray X4 platform. It changes the stiffness profile at the rear top-deck to give tuners another tool for balancing rear traction and chassis feel.
Fitting the deck is a direct swap at the X4 rear upper deck location using the existing screw pattern. Routine model workshop tools like hex drivers are adequate; always verify threads and fastener condition during replacement to secure the part correctly.
This deck should be treated as part of an overall setup package: altering top-deck stiffness affects load transfer during acceleration, braking and cornering, so record changes and pair with damper or spring adjustments to reach the desired handling.
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