Cummins Westport Inc—a joint venture between Cummins Inc. and Westport Innovations Inc. — delivers high-performance alternati ... ve fuel engines for the global market. CWI engines are manufactured by Cummins, with warranty, service, and aftermarket support provided by the Global Cummins Distributor and Dealer network. Cummins Westport Inc (CWI) has produced over 70,000 heavy duty natural gas vehicle engines designed to meet the most stringent emissions regulations and provide efficient and reliable service. Certified with a maintenance free catalyst, 2018 Cummins Westport engines provide Ultra Low NOx emissions that are up to 90% below current North America EPA Standards, meeting or exceeding the toughest USA Environmental Protection Agency (EPA), California Air Resources Board, and EURO emissions standards. CWI offers three natural gas engines the 6.7 litre B6.7N, the 8.9 litre L9N, and the 11.9 liter ISX12N , with ratings up to 400 HP. Common natural gas applications are heavy duty refuse and dump trucks, medium and heavy duty trucks, vocational applications and urban transit, shuttle, school and articulated buses. All CWI natural gas engines are capable of operating on compressed (CNG) or liquid (LNG) natural gas, as well as Renewable Natural Gas (RNG) that meets fuel specifications. Using RNG as a fuel significantly reduces a vehicles greenhouse gas emissions. Calculate the emissions benefits at: http://cwiplaybook.com/assess/greenhouse-gas-emissions-calculator/ read more