A+ PillarA+ Chassis Tie In Upgrade Take your cage setup to the next level with our A+ Chassis Tie In optiondesigned to significantly increase overall strength, rigidity, and safety. Our A+ pillar adds an extra support bar that connects the front of your cage down to the chassis of your vehicle. Instead of the cage only sitting on factory mounting points, this adds a direct tie in to the frame. In simple termsit makes your cage a lot stronger. It helps reduce