News Releases

Published: May 29, 2008

Westport Announces Fiscal 2008 Fourth Quarter & Year End Conference Call for Tuesday, June 3, 2008

VANCOUVER, BC – Westport Innovations Inc. (TSX:WPT) , a global leader in alternative fuel, low-emissions transportation technologies, will disclose its fourth quarter and fiscal year 2008 financial results on Tuesday, June 3, 2008 before market open. To coincide with the disclosure, Westport has scheduled a conference call for Tuesday, June 3, 2008 at 8:00am Pacific Time (11:00am Eastern Time).

The public is invited to listen to the conference call in real time or by replay. To access the conference call by telephone, please dial: 800-952-4972 (North America Toll-Free) or 416-641-2140. To access the conference call replay after the call, please dial 800-408-3053 or 416-695-5800 using the passcode # 3260120. The replay will be available until June 10, 2008, however, the webcast will be archived on the Company’s website.

The webcast of the conference call can be accessed through the Westport website at www.westport.com by selecting “Investors” and then “Investor Overview” from the main menu. Replays will be available in streaming audio on the same website shortly after the conclusion of the conference call.

About Westport

Westport, a division of Westport Fuel Systems Inc., engineers the world’s most advanced natural gas engines and vehicles. We work with original equipment manufacturers worldwide from design through to production, creating products to meet the growing demand for vehicle technology that will reduce both emissions and fuel costs. To learn more about our business, visit www.westport.com, subscribe to our RSS feed, or follow us on Twitter @WestportDotCom

Cautionary Note Regarding Forward Looking Statements

This document contains forward-looking statements, including statements regarding the demand for our products, the future success of our business and technology strategies, investment, cash and capital requirements, intentions of partners and potential customers, the performance and competitiveness of our products and expansion of product coverage, future market opportunities, speed of adoption of natural gas for transportation, growth in demand as a result of new emission standards and terms of future agreements. These statements are neither promises nor guarantees, but involve known and unknown risks and uncertainties and are based on assumptions that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activities, performance or achievements expressed in or implied by these forward looking statements. These risks and assumptions include risks and assumptions related to our revenue growth, operating results, industry and products, the general economy, conditions of and access to the capital and debt markets, governmental policies and regulation, technology innovations, fluctuations in foreign exchange rates, global government stimulus packages, the acceptance of natural gas vehicles in fleet markets, the relaxation or waiver of fuel emission standards, the inability of fleets to access capital or government funding to purchase natural gas vehicles, the sufficiency of bio methane for use in our vehicles, the development of competing technologies as well as other risk factors and assumptions that may affect our actual results, performance or achievements or financial position discussed in our most recent Annual Information Form and other filings with securities regulators. Readers should not place undue reliance on any such forward-looking statements, which speak only as of the date they were made. We disclaim any obligation to publicly update or revise such statements to reflect any change in our expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward looking statements except as required by National Instrument 51-102.

More Information

Westport Fuel Systems
(Investor Inquiries)

Shawn Severson
Investor Relations
T 604-718-2046
invest@wfsinc.com
www.wfsinc.com

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