Will this work with an aftermarket rear bumper or diffuser?

This bar is engineered for the factory rear bumper assembly. If you're running an aftermarket bumper, clearance may be compromised — test-fit before final installation to confirm fitment.

Do I need to remove the bumper to install this?

The reinforcement bar mounts at factory attachment points. Full bumper removal may simplify access, but the bar itself does not require bumper removal — work from underneath or partial disassembly depending on your workspace.

Can I paint this before or after install?

Paint it after installation to match your bumper color and avoid damage during handling. Once mounted, mask off adjacent panels and apply primer and paint following standard automotive procedures.