Will this fit my dual exhaust setup?

Yes. This rear lip is specifically designed with clearance for dual exhaust systems. The center section remains open to avoid contact with exhaust tips. Verify your exhaust tip placement before installation to ensure adequate spacing.

Does the rear lip sit flush against the bumper, or will it stick out?

The rear lip mounts via the factory bumper attachment points and sits as an extension below the bumper line. It adds minimal forward projection. Check your parking clearance in tight spaces before final installation.

What prep work do I need to do before painting?

Sand the surface with appropriate grit to create a smooth base, then apply your chosen primer and finish. FRP takes standard automotive paint and clear coat well. A test panel on scrap FRP is always a good idea before committing to your final piece.