HPI Baja Alloy Rear Skirt by GPM BJ903R  [BJ903R]

Alloy rear skirt for HPI Baja

This GPM aftermarket rear skirt is an RC-scale alloy replacement part labeled BJ903R, intended to reinforce and protect the rear lower body area on HPI Baja models. The component is described as an alloy piece that mounts to stock body or bumper mounting points, providing a stiffer rear profile that helps resist flex and abrasion during rough off-road runs.

Fit and installation follow common Baja body hardware locations; plan to reuse the vehicle’s existing fasteners and body posts where possible. Typical installation requires removing the rear body shell, aligning the skirt with existing mounting tabs, and securing it with the original screws or supplied hardware. No special tools beyond standard hex drivers and a basic set of hand tools are required.

From a tuning perspective this rear skirt is a chassis-level accessory: adding a rigid alloy skirt changes rear-body stiffness and can influence airflow and debris deflection around the rear bumper area. For setup work, test with standard suspension and tire choices first, then evaluate handling changes on the track; the skirt’s stiffness can be combined with shock and toe adjustments to balance rear traction and stability.

Use this alloy rear skirt when you want a durable, stiffer lower rear body surface for HPI Baja-scale off-road runs; verify fit on your specific Baja shell before finishing work.