Westport Innovations Inc. is involved in the research and development of environmental technologies, including high-pressure direct injection combustion technology that allows diesel engines to operate on cleaner burning gaseous fuels, such as natural gas without sacrificing performance or fuel economy. It also has a joint venture interest in Cummins Westport Inc. (CWI), which is a joint venture with Cummins Inc. (Cummins). CWI develops, supports and markets a product line of low-emission, high performance engines and ancillary products using intellectual property developed by the Company and Cummins. It has four business units: CWI, which is focused on natural gas engine applications for urban fleets ranging from 5.9 liters to 8.9 liters; Westport Heavy Duty, focused on liquid natural gas systems for heavy-duty trucks; Juniper Engines Inc., which is focused on two liters and 2.4 liters industrial engines, and Weichai Westport Inc., focused on developing heavy-duty engines in China.