Does this come with fasteners and brackets?

The diffuser set includes the two pieces. Verify your vehicle's OEM bumper mounting bolt pattern before ordering — this ensures a clean bolt-on fit to your existing attachment points.

What prep work is needed before I paint?

Sand the surface with standard body preparation methods before applying primer and topcoat. Check that mounting holes and edges are clean and free of debris for the best finish.

Will this fit if I have aftermarket exhaust or a custom bumper?

This set is engineered for stock rear bumper geometry. If you've modified the bumper or exhaust outlet, measure the clearance between the diffuser louvres and your setup before fastening to avoid contact.