Westport Receives Largest Non-Port Order to Date For Heavy Duty Fuel Systems::HayDay Farms Orders 20 LNG Trucks With Westport HPDI

published: June 5, 2008

VANCOUVER, BC – Westport Innovations Inc. (TSX:WPT), a global leader in alternative fuel, low-emissions transportation technologies, announced today that HayDay Farms of Blythe, California has ordered 20 heavy duty liquefied natural gas (LNG) trucks featuring Westport’s High Pressure Direct Injection (HPDI) technology. The HPDI technology will allow HayDay’s new Kenworth T800 trucks to operate in regional haul applications with the same power and efficiency as a diesel engine and provide superior economic and environmental benefits by running natural gas.

“At over US$4 per gallon for diesel and the natural gas equivalent at approximately US$3 per gallon, purchasing LNG trucks delivering the same torque and efficiency just makes sense,” said Dale Tyson, Vice President of HayDay Farms. “Running LNG trucks with Westport’s HPDI technology can help reduce fuel costs and harmful emissions providing economic and environmental drivers in line with HayDay’s core business values.”

“Providing a highly efficient, low-emission Westport ISX G 15 litre engine with a comprehensive support program for customers like HayDay Farms gives Westport a distinct competitive advantage,” stated Michael Gallagher, President & Chief Operating Officer of Westport Innovations. “The economic drivers in concert with environmental benefits for customers like HayDay Farms are now creating unprecedented interest in our new natural gas fuel systems for heavy duty trucks.”

About HayDay Farms

Hayday Farms was founded in 1986 with the acquisition of Toshin Trading, Inc., a hay brokerage company located in Blythe, California. Along the way, the name was changed to reflect its core business. HayDay Farms focuses on producing quality feed for foreign and domestic dairy and beef cattle. Show and stock horses are also a market segment with alfalfa, timothy, oats, Bermuda hay and hay cubes made available to ranch stables and feed stores. In addition, the Company has created a show horse hay package consisting of small compressed hay bales of alfalfa and Bermuda hay. Additional information on HayDay Farms can be found on their website at www.haydayfarms.com.

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 North American transportation applications such as trucks and buses. The Westport LD division is one of the global leaders for natural gas and LPG fuel 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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