MAN Expects Sales Boost from Chinese Emissions Regs Maritime Activity Reports, Inc. The MAN L21/31 engine (Image: MAN Energy Solutions) Engine manufacturer MAN Energy Solutions said it expects to see increased sales from the imminent China’s Stage II—commonly known as the C2-emission standard (GB15097 regulation)—due to enter into force in July 2021. The new legislation will primarily apply to inland waterways, coastal areas and most rivers, covering domestic bulk carriers, feeder containers, oil tankers, passenger RoRos and government vessels, and MAN said it expects the introduction of the new regulations will spur sales of its small-bore, four-stroke MAN L21/31 engine type.