Exhaust Flange Guard. The ZETA flange protector offers protection for the vulnerable exhaust flange. Some owners who have experienced a broken exhaust flange know that it will end a ride day and leave the bike "Open Header." The ZETA exhaust flange protector is added insurance 2-stroke owners and is more economical than a new exhaust flange. Exhaust flange guard protects exhaust manifold from damage should the pipe receive impact from trees, stumps, or rocks.