Westport Announces Fiscal 2009 First Quarter Conference Call for Tuesday, August 5, 2008

VANCOUVER, BRITISH COLUMBIA, Jul 31 (MARKET WIRE) --
Westport Innovations Inc. (TSX: WPT), a global leader in alternative
fuel, low-emissions transportation technologies, will disclose its first
quarter financial results on Tuesday, August 5, 2008 before market open.
To coincide with the disclosure, Westport has scheduled a conference call
for Tuesday, August 5, 2008 at 7:00am Pacific Time (10:00am 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
replay after the call, please dial 800-408-3053 or 416-695-5800 using the
passcode #3267784. The replay will be available until August 12, 2008;
however, the webcast will be archived on the Company's website.

The webcast of the conference call can be accessed on 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 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
biofuels such as landfill gas. Cummins Westport Inc., Westport's joint
venture with Cummins Inc., manufactures and sells the world's broadest
range of low-emissions alternative fuel engines for commercial
transportation applications such as trucks and buses. BTIC Westport Inc.,
Westport's joint venture with Beijing Tianhai Industry Co. Ltd.,
manufactures and sells LNG fuel tanks for vehicles.

Note: This document contains forward-looking statements about Westport's
business, operations, technology development or the environment in which
it operates, which are based on 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 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.
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:
Westport Innovations Inc.
Darren Seed
Director, Investor Relations
(604) 718-2046
Email: invest@westport.com
Website: www.westport.com

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