Will this bracket work with a lower valance or diffuser?

Mounting method not specified — test-fit your bumper and any lower trim pieces before final installation to confirm clearance and alignment.

Do I need to remove the bumper to install this bracket?

Most bracket replacements require bumper removal for access to mounting points. Refer to your vehicle's service manual for the exact removal and reinstallation sequence.

Does this come with bolts or fasteners?

The bracket itself ships alone. Fasteners are not confirmed — you'll need to source hardware that matches your OEM specifications.