Kortrijk, Belgium (October 18, 2007) - Cummins Westport EPA 2010 compliant ISL-G gas engine will be displayed for the first time to the bus industry at Busworld (stand PAV4-8). It is the world's first heavy duty engine for urban bus applications to be certified to the "near-zero" emissions standard. With improved low end torque and maintenance-free aftertreatment, the ISL-G delivers diesel-like performance and reliability. Customers can take advantage of the lower cost of natural gas as well as improve their environmental credentials.

The ISL-G surpasses EPA 2007 phase-in levels and meets 2010 emissions standards of 0.2 g/bhp-hr NOx and 0.01 g/bhp-hr PM. This exceptionally low level means that it will easily meet Euro 5 and EEV levels during 2008.

Based on the Cummins ISL diesel engine, the ISL-G leverages Cummins proven cooled Exhaust Gas Recirculation (EGR) technology, as used extensively on 2002 and 2007 products. Due to the inherently lower levels of NOx in a gas engine and the near-zero emissions levels required for EPA 2010 compliance, Cummins proven EGR is the right technology and most cost effective solution for a natural gas application. The engine uses stoichiometric combustion, where fuel is burned completely, eliminating exhaust constituents such as carbon and sulphur. This allows for the use of a maintenance free three way exhaust catalyst, commonly seen in passenger cars.

In addition to delivering ultra low emissions, the ISL-G, with ratings from 186-239kW (253-325ps), will deliver increased thermal efficiency and over 30% higher low-speed torque compared with current natural gas engines.

Greg Young, Cummins Westport Sales Leader for EMEA said, "The latest ISL-G builds on the reputation of the Cummins B, C and L Natural Gas bus engines, which have seen substantial success in major cities around the world. The high performance with ultra low emissions makes it ideal for bus applications in large cities looking for major pollution reductions. In fact, Cummins Westport has already logged over 500 orders worldwide for the ISL-G including U.S. transit organisations such as Sacramento Regional Transit and the Orange County Transportation Authority."

Cummins Westport Inc. manufactures and sells the world's widest range of low-emissions alternative fuel engines for commercial transportation applications such as trucks and buses. Cummins Westport is a joint venture of Cummins Inc. and Westport Innovations Inc., a leading developer of technologies that allow engines to operate on clean-burning fuels such as natural gas, hydrogen, and hydrogen-enriched natural gas (HCNG). Cummins Inc. is the world's largest independent manufacturer of diesel engines and related components. With over 30,000 employees, Cummins reported sales of $11.4 billion in 2006 and produced over 833,000 engines. Headquartered in Columbus, Indiana, (USA) Cummins serves customers in more than 160 countries through its network of 550 company-owned and independent distributor facilities and more than 5,000 dealer locations. A substantial manufacturing presence in Europe includes the Mid-Range engine plant at Darlington UK and the High Horsepower engine plant at Daventry, UK.