~ Natural Gas-powered Ford F-250 Displayed in Times Square; Presentations
and Video Available on Westport Website Following Event ~

VANCOUVER, May 24, 2012 /PRNewswire/ – Westport Innovations Inc. (TSX:WPT /
NASDAQ:WPRT), the global leader in natural gas engines, today announced
that it will ring The NASDAQ Stock Market Closing Bell on Thursday, May
24, 2012 at 4:00 pm (Eastern Time) at NASDAQ MarketSite in New York.
Westport will also host its 2012 Investor Day on Thursday, May 24, 2012
at the NASDAQ MarketSite. Westport management presentations will
provide an overview of the Company’s vision, key industry trends,
financial goals, business division updates, and product and
technological development.

Speaking on behalf of the Company will be:
• David Demers, Chief Executive Officer
• Bill Larkin, Chief Financial Officer
• Patric Ouellette, Chief Technology Officer
• Clark Quintin, President, Westport HD
• Ian Scott, President, Westport LD

Following a 700 mile journey from Detroit to New York entirely on
natural gas, the new Westport WiNG™-powered Ford F-250 pick-up truck
will be displayed in front of the NASDAQ MarketSite, in Times Square
from 1:00 p.m. Eastern Daylight Time to 5:00 p.m. Eastern Daylight
Time.

Closing Bell Live Webcast:
A live webcast of the NASDAQ Closing Bell will be available at:
http://www.nasdaq.com/about/marketsitetowervideo.asx.

Photos:
To obtain a hi-resolution photograph of the Market Close, please go to http://www.nasdaq.com/reference/marketsite_events.stm and click on the market close of your choice.

Investor Day Replay Webcast:
The event will not be available via live webcast. However, a video
replay of the event, including presentation materials, will be
available within 24 hours after the event on www.westport.com/investors.

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 helps
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. Westport’s joint venture with
Cummins Inc., Cummins Westport Inc. designs, engineers and markets
spark-ignited natural gas engines for North American transportation
applications such as trucks and buses. Westport LD division is one of
the global leaders for natural gas and liquefied petroleum gas (LPG)
fuel in passenger cars, light-duty trucks and industrial applications
such as forklifts. To learn more about our business, visit our website
or subscribe to our RSS feed at www.westport.com, or follow us on Twitter @WestportDotCom.

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.

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. The contents of any website, RSS feed or Twitter
account referenced in this press release are not incorporated by
reference herein.

SOURCE Westport Innovations Inc.