Westport Announces Fourth Quarter and Year End Fiscal 2011 Conference Call for Wednesday, June 8, 2011

published: June 1, 2011

VANCOUVER, BC – Westport Innovations Inc. (TSX:WPT/NASDAQ:WPRT), a global leader in alternative fuel, low-emissions transportation technologies, will disclose its fourth quarter and fiscal year 2011 financial results on Wednesday, June 8, 2011 before market open. To coincide with the disclosure,Westporthas scheduled a conference call for Wednesday, June 8, 2011 at 8:00 am Pacific Time (11:00 am Eastern Time).

Live Conference Call & Webcast

The public is invited to listen to the conference call in real time by telephone or webcast. To access the conference call by telephone, please dial: 1-800-319-4610 (Canada& USAtoll-free) or 604-638-5340. The live webcast of the conference call can be accessed through the Westportwebsite at www.westport.com/investors.

Replay Conference Call & Webcast

To access the conference call replay, please dial 1-800-319-6413 (Canada & USA toll-free) or 604-638-9010 using the pass code 1847. The replay will be available until June 22, 2011. Shortly after the conference call, the webcast will be archived on the Company’s website and replay will be available in streaming audio.

About Westport Innovations Inc.

Westport Innovations Inc. is a leading global supplier of proprietary solutions that allow engines to operate on clean-burning fuels such as compressed natural gas (CNG), liquefied natural gas (LNG), hydrogen, and renewable natural gas (RNG) fuels such as landfill gas and help reduce greenhouse gas emissions (GHG). Westport technology offers advanced LNG fueling systems with direct injection natural gas engine technology for heavy-duty vehicles such as highway trucks and off-road applications such as mining and rail. Cummins Westport, our joint venture with Cummins Inc., designs, engineers and markets spark-ignited natural gas engines for medium- and heavy-duty transportation applications such as trucks and buses. Westport is also one of the global leaders for natural gas and liquefied petroleum gas (LPG) fuel system technology, design, and components in passenger cars, light-duty trucks and industrial applications such as forklifts. To learn more about our business, visit westport.com, subscribe to our RSS feed, or follow us on Twitter @WestportDotCom.

Cautionary Note Regarding Forward Looking Statements

Note: 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.

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Westport Innovations Inc.

Darren Seed

Vice President, Investor Relations and Communications

604-718-2046

invest@westport.com

www.westport.com

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