Cummins Westport Inc.

Cummins Westport Inc.
Westport Innovations Inc.
TSX : WPT

Westport Innovations Inc.

September 23, 2005 16:47 ET

Cummins Westport Awarded $690,000 for ISL G Low Emissions Engine Development; Prototype Engine Featured at APTA in Dallas, Texas

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - Sept. 23, 2005) - Cummins Westport Inc. (CWI) today announced it has been awarded $690,000 in funding from the South Coast Air Quality Management District (SCAQMD) for CWI's previously announced ISL G engine product development program. The ISL G natural gas engine, for medium-duty truck, refuse and urban transit markets, is scheduled for commercial launch in 2007.

Development of the new ISL G natural gas engine, which is also funded with an initial $600,000 from the U.S. Department of Energy's National Renewable Energy Laboratory, is already well underway. OEM integration work for the 2007 ISL G has been initiated and pre-commercial demonstration in southern California, SCAQMD's jurisdiction, will begin in the coming months.

The Cummins Westport ISL G engine will surpass U.S. Environmental Protection Agency (EPA) and California Air Resources Board (CARB) 2007 phase-in levels and meet 2010 emission standards of 0.2 g/bhp-hr oxides of nitrogen (NOx) and 0.01 g/bhp-hr particulate matter (PM) at launch in 2007, utilizing cooled exhaust gas recirculation (EGR) and a passive three-way catalyst.

A prototype of the high-performance low-emissions ISL G natural gas engine will be unveiled September 26, 2005 in Dallas, Texas at the American Public Transportation conference (APTA). The APTA EXPO occurs every three years, presenting the world's premier collection of manufacturers and suppliers of transit technology innovation.

Guan Saw, President of Cummins Westport Inc., commented, "We are thrilled to have additional support for this engine product and its goals. This engine will meet U.S. federal and local emissions standards well ahead of schedule, and provide an immediate and lasting solution for our customers that is both economically and environmentally beneficial."

In May 2004, Cummins Westport introduced the L Gas Plus, which is the platform for Cummins Westport's next generation natural gas engines. The current L Gas Plus is rated at 320 horsepower and 1,000 lb-ft torque and is capable of meeting 2007 EPA standards for NOx and PM.

SCAQMD is the air pollution control agency for Orange County and major portions of Los Angeles, San Bernardino and Riverside counties in California.

About Cummins Westport Inc.

Cummins Westport Inc., a joint venture of Cummins Inc. (NYSE:CMI) and Westport Innovations Inc. (TSX:WPT), manufactures and sells the world's widest range of low-emissions alternative fuel engines for commercial transportation applications such as trucks and buses. The company has over 12,000 alternative fuel engines in service around the world. Cummins is a global power leader in engines, electrical power generation systems, and related technologies. Westport Innovations is the leading developer of technologies that allow engines to operate on clean-burning fuels such as natural gas, hydrogen, and hydrogen-enriched natural gas (HCNG). www.cumminswestport.com

Note: This document contains forward-looking statements about Cummins Westport's business, operations, technology development or to the environment in which it operates, which are based on Cummins Westport's estimates, forecasts and projections. These statements are not guarantees of future performance and involve risks and uncertainties that are difficult to predict, or are beyond Cummins Westport's control. Consequently, readers should not place any undue reliance on such forward-looking statements. In addition, these forward-looking statements relate to the date on which they are made. Cummins Westport disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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