Cummins Westport Inc. ("CWI") (TSX: WPT), a leading provider of high-performance, alternative fuel engines for the global market, announced today that Sterling Trucks of Redford, Michigan has launched a new Sterling® Set-Back 113, its first natural gas vehicle, featuring the Cummins Westport ISL G engine. The Cummins Westport ISL G, an 8.9 liter stoichiometric cooled-exhaust gas recirculation (EGR) engine, offers the lowest emissions available in the industry without sacrificing top-level performance and efficiency.

"By introducing the Set-Back 113 with natural gas, we're giving our customers a hard-working truck that reduces both costs and environmental emissions," noted Richard Shearing, Manager of Product Strategy for Sterling Truck Corporation.

Guan Saw, President, of CWI added, "This is an opportunity to expand the CWI OEM platform with Sterling, one of North America's market leading truck manufacturers. The Sterling natural gas trucks will provide a clean, low emission solution for medium-duty applications in short-haul, port operations, as well as natural gas utilities and municipal fleets."

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 (grams per brake horsepower hour) NOx (nitrogen oxide) and 0.01 g/bhp-hr PM (particulate matter). Based on the Cummins ISL, the ISL G leverages Cummins' proven cooled 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. CWI has already logged significant orders for the ISL G from U.S. transit properties, including Los Angeles Metropolitan Transit Authority, Sacramento Regional Transit and the Orange County Transportation Authority. More information about the ISL G can be found at: www.cumminswestport.com/products/isl...

About Sterling

Sterling Truck Corporation, headquartered in Redford, Mich., produces a full line of Class 3-8 work trucks for regional hauling and diverse vocational applications. Sterling is a subsidiary of Daimler Trucks North America LLC and is the recipient of the 2007 J.D. Power and Associates award for Highest in Customer Satisfaction in Heavy Duty Truck Dealer Service. Daimler Trucks North America produces and markets Class 3-8 vehicles and is a Daimler company, the world's largest commercial vehicle manufacturer.

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. CWI 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.

Contacts:
Cummins Westport Inc. / Westport Innovations Inc.
Darren Seed
Director, Investor Relations
(604) 718-2046
Email: invest@westport.com
Website: www.westport.com

Cummins Westport Inc.
Sales & Marketing; Product Information
(604) 718-8100
Email: sales@cumminswestport.com
Website: www.cumminswestport.com

Cummins Inc.
Mark Land
Public Relations Director
(317) 610-2456
Email: mark.d.land@Cummins.com
Website: www.cummins.com

Source: Marketwire (May 12, 2008 - 9:01 AM EDT)

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