Can I install individual pieces, or does the kit need to go on as a complete set?

You can install any combination. Front bumper, side skirts, and rear bumper are independent assemblies. Many owners run the full four pieces for a cohesive look, but mixing pieces with OEM panels is straightforward if that fits your build plan.

Do I need gap filler or seam tape where pieces meet the OEM body?

All mounting points are designed around factory hardpoints, so seams should sit flush. Primer and paint will bridge any minor surface transitions. Standard body shop practice — sand, fill if needed, then coat the full panel for a seamless finish.

Should I paint each piece separately or after installation?

Both methods work. Separate painting (off the car) gives you better control and coverage; on-car painting lets you blend edges and ensure color match across the entire assembly. Your choice depends on shop setup and how critical color matching is for your vehicle's existing paint.