Cummins Westport Inc.

Cummins Westport Inc.
Westport Innovations Inc.

Westport Innovations Inc.

July 10, 2007 14:30 ET

Cummins Westport Leads Industry With EPA Certification of 2007 ISL G Certified to 2010 Emissions Standards

VANCOUVER, BRITISH COLUMBIA--(Marketwire - July 10, 2007) - Cummins Westport Inc. (CWI) (TSX:WPT), a leading provider of high-performance alternative fuel engines for the global market, announced today that it has received formal certification from the United States Environmental Protection Agency (US EPA) for 0.2g/bhp-hr oxides of nitrogen (NOx) and 0.01 g/bhp-hr particulate matter (PM).

"The ISL G is the world's first heavy duty engine for urban bus and truck applications to be certified to the 2010 EPA standard," said Guan Saw, President of Cummins Westport. "With improved low end torque and maintenance-free aftertreatment, the ISL G will deliver diesel-like performance and reliability and the opportunity for customers to take advantage of the lower cost of natural gas."

About the Cummins Westport ISL G

The ISL G surpasses EPA 2007 phase-in levels and meets 2010 emission standards of 0.2 g/bhp-hr NOx and 0.01 g/bhp-hr PM. Based on the Cummins ISL, the ISL G leverages Cummins proven Exhaust Gas Recirculation ("EGR") with stoichiometric combustion allowing for the use of a three way catalyst, which is maintenance free and is in common use in passenger cars. In addition to delivering ultra low emissions, the ISL G, with ratings from 250 to 320 horsepower, will deliver increased thermal efficiency and over 30% higher low-speed torque compared with today's CWI "Plus" engines. Cummins Westport has already logged over 500 orders for the ISL G from U.S. transit properties, including Sacramento Regional Transit and the Orange County Transportation Authority (OCTA). More information about the ISL G can be found at:

About Cummins Westport Inc.

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. (NYSE:CMI) a corporation of complementary business units that design, manufacture, distribute, and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions, and electrical power generation systems, and Westport Innovations Inc. (TSX:WPT), 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).

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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