Our Cr racing  2022-23 146,155,163/165 Tunnel stiffener/Rear Bumper Kits are designed to help strengthen the stock tunnel for purposes such as hauling extra fuel/gear ,Towing or repairing a damaged tunnel .We have extended it past the suspension bracket for additional Tunnel support.The side plates and bumper are constructed of 6061aircraft aluminum and comes with all necessary predrilled holes making it a super easy installation.Our kit's come with the industries best fastener's and recommend using an Air Riveter to install.Allow approximately 45 minutes to install.All We also offer Custom colors for an additional fee so please email or call for more details.Install video coming soon! so subscribe to our youtube channel.