Will this reinforcement bar work behind my stock bumper cover?

Yes, it mounts directly to the vehicle frame behind the factory fascia. Your existing bumper cover stays in place.

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

The reinforcement bar mounts at factory anchor points, but you'll want to test-fit and confirm your access path before committing. Some builders remove the fascia for easier installation; others work from underneath.

Does this come with fasteners?

Only the reinforcement bar assembly is included. Mounting hardware is not confirmed — verify your existing fastener condition at factory mounting points and source replacements if needed.