The Mugen Seiki MBX8 One Piece Engine Mount is an optional engine mount for the MBX8R or MBX8. This one piece mount provides racers with a more rigid engine mount by helping to eliminate the chassis flex beneath the engine, while at the same time creating a more solid and secure mount for the engine case. Plus, its more convenient and easier to install than the the standard two piece mount, making this a must have upgrade for your MBX8. Package includes one engine mount.