Rear bumper extension underskirt for XTREME Twister / Twister Speciale bodyshell. This product allows these bodies to comply with IFMAR and JMRCA regulations. Molded from 0.5mm thick Lexan after 3D modeling to fit 100% to the rear bumper shape. The shape also takes into account the thickness of the body, so it will be flush with the rear bumper after installation.