The fender liners in your vehicle often get damaged or misplaced. These plastic liners keep rocks and road debris from hitting the metal surfaces of your wheel house. These small chips cause by rocks can often lead to premature rust in the wheel well. Replace your fender liner with a new unit.
While doing your fender liner, check to see if your belly pan and other protective pieces are missing. If they are, ECS Tuning has a wide variety of replacement panels available.