BMS’ most protective case in the JB4 line-up. The sleek, stylish JB4 billet aluminium enclosure withstands drops, shocks and bumps while protecting electronics from dirt and water. CNC machined with a rubber sealing ring. Ideal for all-weather F and G chassis BMW and other JB4 applications. Compatible with all BMS JB4 & Stage 1 tuners. Made in USA.