See: Maxima Mx Europa

Maxima have released a teaser image of the successor of Mx B2R engine, the Mx B4. This engine is based on the new O.S Speed 21XZ-B Spec III and shares his power characteristics between the Spec II and the B2101. Overall it´s easier to access the right power band and the runtime remains very optimized as all Mx Engines, and more than an “standard” engine. The Maxima Mx B4 engine will be ready for the IFMAR Worlds in Las Vegas.