• Higher horsepower and torque. The Westport HD 15L will now be available in North America with up to 550 hp (410 kW) and 1850 lb-ft (1,364 N·m) of torque, targeted for heavy haul vocations. This power/torque option for North America now matches what has been available in Australia for more than three years and more than 10 million kilometers of rugged service. Availability of this enhancement is expected in early 2013.

• Emissions aftertreatment improvements. The Westport HD 15L will feature an optimized emissions equipment system, tailored specifically to the lower emissions profile of natural gas to reduce cost and weight and improve operation and reduce user intervention. Availability of these enhancements will commence during 2013.

• Eaton Ultrashift Plus AMT. Automated manual transmission is now available in all Kenworth and Peterbilt configurations in North America for fleets that desire additional driver options.

• Heavy front end. Available on Peterbilt Motors’ 367 SB, Westport HD now offers 16,000 lb front axles as demanded by a number of vocational applications.

The Westport HD15L LNG engine is available across a broad range of Class 8 tractors; Westport HD15L product can be ordered in multiple configurations in Kenworth Truck Company’s T800 and Peterbilt Motors’ 386 (SmartWay included), 367, 367SB and 388 in North America, and Kenworth T409SAR, T659, and K200 in Australia.