C30 Mud Flaps are a great idea for updating your GMC. Keep the sides of your ride clean with Mud Flaps. Show your creativity with new C30 Mud Flaps. Mud Flaps keep the rocks from chipping your paint. C30 Mud Flaps add eye appeal to your truck. Mud Flaps are an essential accessory for any vehicle. Make less work of cleaning your vehicle by installing new Mud Flaps.