Will this lower my front end and affect ground clearance?

Front lips add visual depth to the rocker line without significantly reducing ground clearance. Verify your current bumper-to-pavement distance and account for any lip extension when checking low-angle approach. Driveways and steep inclines should be navigated as you do now.

Is FRP rigid enough for daily driving, or will it flex and crack?

FRP is engineered for flex under impact without shattering — it absorbs minor contact better than rigid plastic. Once installed, it performs the same as your factory bumper cover. Avoid dragging on speed bumps and curbs, and the material will hold up through normal street use.

Does this include mounting hardware and fasteners?

The lip assembly is included. Reference your vehicle's OEM bumper attachment points and existing hardware to determine what fasteners or brackets you'll need. Most installations use existing factory holes; measure twice before drilling any new holes.