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Westport Results for First Quarter Ending June 30, 2005 Show Steady Progress

VANCOUVER, British Columbia--July 28, 2005--Westport Innovations Inc. (TSX:WPT) today reported results for its first fiscal quarter ended June 30, 2005, and provided an update on its business operations.

Westport's consolidated net loss for the three months ended June 30, 2005 was $6.2 million ($0.08 loss per share) compared to $6.9 million ($0.11 loss per share) for this quarter last year, a 10% improvement. Higher dollar gross margins and decreased amortisation contributed to the decreased loss. Total consolidated revenues for the quarter were $10.5 million, up from $8.8 million for the same period last year, a 19% increase.

Revenues and gross margins in the quarter were positively impacted by Cummins Westport Inc.'s (CWI's) higher parts revenue and engine product mix. Parts revenues were $3.5 million compared to $2.3 million this quarter last year. Product revenues were up 8% at $7.0 million on shipments of 310 engines this quarter, compared to $6.5 million on 352 units for this quarter last year. However, the mix was improved with more of the higher horsepower and accordingly higher priced C Gas Plus and L Gas Plus engines being shipped than the lower horsepower B-series natural gas engine, resulting in increased revenues and dollar margins on a per unit basis. Approximately 75% of revenue was from North American customers, primarily transit agencies and where demand for natural gas continues to be strong. Gross margin percentages were steady at 26%.

Expenses were relatively flat except for a $0.4 million increase in sales and marketing as the company continues its business development efforts, particularly in Asia. CWI continued to be profitable in the quarter, contributing a positive $0.1 million to Westport's results, a significant improvement over CWI's $1.2 million loss this quarter last year. Although revenues and contribution can be volatile from quarter to quarter, since CWI was re-launched on January 1, 2004, it has been profitable in 4 of 6 quarters.

At June 30, 2005, Westport's cash and short term investments were $14.6 million, down from $20.3 million at March 31, 2005. For the quarter, cash used in operations before changes in working capital improved by 35% to $3.0 million, down from $4.7 million this quarter last year. However, slower than anticipated collection on government funding receivables was a primary contributor to the $2.3 million in cash used for working capital purposes. Subsequent to June 30, 2005, $1.7 million of government funding receivables were collected.

"We're making steady progress on our business plan," said David Demers, Westport's Chief Executive Officer. "Our net loss continues to decrease, CWI continues to be profitable, and we are intensifying our business development efforts to capitalize on new opportunities, particularly in Asia and Australia, and to move our existing projects forward."

Business Programs Update

Cummins Westport Inc.

Cummins Westport's earlier sales and marketing efforts continue to come to fruition. The Philippines took delivery of their first ever natural gas buses for public transit, with the President of the Philippines Gloria Macapagal-Arroyo as well as Chinese and Canadian Ambassadors present at the launch. These buses are powered by Cummins Westport engines but were manufactured in China.

This collaboration between Cummins Westport and Chinese OEMs has resulted in wider access to Chinese transit markets as well as China's export markets. This quarter, Cummins Westport entered the Bangladesh transit market with an order for 30 engines, plus options to purchase a total of 120 engines by the end of the year.

In addition to the growth of the market potential in Asia and CWI's efforts to develop markets as opportunities present themselves, Cummins Westport continues to maintain established leadership in the North American alternative fuel transit market. The company had a strong quarter in North America, delivering its low-emissions engines to several large customers including Los Angeles and San Diego.

Cummins Westport's leadership in alternative fuel engine development and deployment was recently recognized by the US Department of Energy (DOE) Clean Cities Program, and the company was presented a National Partner of the Year Award.

Westport Program Highlights

The Clean Air Corridor project, a heavy-duty truck technology demonstration along Highway 401 between Windsor, Ontario and Detroit, Michigan, was launched in May to showcase Westport's next-generation high pressure direct injection technology. It is the first demonstration of this type on Canadian soil. The Westport-led consortium participating in the project includes Challenger Motor Freight Inc., Enbridge Gas Distribution Inc., Natural Resources Canada, and Transport Canada. The total project value is $3 million, with funding from Sustainable Development Technology Canada as well as investment from the participating partners.

Westport's demonstration capabilities and efforts also include participation in a planned natural gas and hydrogen-enriched natural gas (HCNG) project led by Sacre-Davey Innovations Inc. In April, Westport and its consortium partners announced new funding of $6 million by the Government of Canada for the Vancouver-based demonstration of transit buses.

In June, Westport was presented the 2005 Leadership in Social Responsibility Award at the Technology Impact Awards in Vancouver. Westport was recognized for its outstanding performance in integrating Corporate Social Responsibility (CSR) principles into corporate culture and operations. The awards are sponsored by the British Columbia Technology Industries Association.

In British Columbia, Westport and Cummins Westport's home province, the Greater Vancouver Transit Authority (TransLink), made a decision July 20 to focus on natural gas engines in upcoming transit bus purchases.

Results Conference Call

Westport has scheduled a conference call for Thursday, July 28, 2005 at 8:00 am (Pacific Time) to discuss the quarterly results. 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: 1-800-936-9754 (North America Toll-Free) or 1-973-935-2048 (International).

Alternatively, the webcast of the conference call can be accessed through the Westport web site at www.westport.com by selecting "Our Investors", and then selecting "Conference Calls & AGMs" from the top menu. Replays will be available in streaming audio on the same website shortly after the conclusion of the conference call.

To view Westport's first quarter financials, please point your browser to the following link: www.westport.com/investor/financial.php.

About Westport Innovations Inc.

Westport Innovations Inc. is the leading developer of environmental technologies that allow engines to operate on clean-burning fuels such as natural gas, hydrogen, and hydrogen-enriched natural gas (HCNG). Westport has technology development alliances in place with Ford, MAN, BMW and Isuzu, as well as an ownership interest in Clean Energy, the largest provider of natural gas for vehicles in North America. Cummins Westport Inc., Westport's joint venture with Cummins Inc., manufactures and sells the world's widest range of low-emissions alternative fuel engines for commercial transportation applications such as trucks and buses.

Note: This document contains forward-looking statements about Westport's business, operations, technology development or to 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.


WESTPORT INNOVATIONS INC.
Consolidated Balance Sheets
(Expressed in Canadian dollars)

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                                         June 30,          March 31,
                                            2005               2005
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                                      (Unaudited)
Assets
Current assets:
 Cash and cash equivalents        $      421,178     $      319,806
 Short-term investments               14,169,439         19,970,877
 Accounts receivable                   7,074,885          6,040,026
 Inventory                             1,314,729          1,481,513
 Prepaid expenses                        393,215            552,231
 ------------------------------------------------------------------
                                      23,373,446         28,364,453

Long-term investments                  9,133,876          9,133,876

Equipment, furniture and
 leasehold improvements               33,609,941         33,525,179
 Accumulated depreciation            (28,627,526)       (27,750,304)
 ------------------------------------------------------------------
                                       4,982,415          5,774,875

Intellectual property                  4,321,394          4,321,394
 Accumulated amortisation             (3,350,154)        (3,152,978)
 ------------------------------------------------------------------
                                         971,240          1,168,416
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                                  $   38,460,977     $   44,441,620
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Liabilities and
 Shareholders' Equity
Current liabilities:
 Accounts payable and accrued
  liabilities                     $    2,745,289     $    4,466,661
 Deferred revenue                      2,539,214          2,639,316
 Demand instalment loan                2,014,211          2,252,720
 Current portion of long-term
  debt obligations                        99,422            104,975
 Current portion of warranty
  liability                            3,722,460          3,665,175
 Current portion of financial
  instruments                            335,745            335,745
 ------------------------------------------------------------------
                                      11,456,341         13,464,592

Long-term debt and other
 long-term obligations                 1,480,685          1,545,064

Warranty liability                     3,217,813          3,063,678

Joint Venture Partner's share of
 income from joint venture               135,305             68,870

Financial instruments                  2,907,173          2,621,458

Shareholders' equity:
 Share capital:
  Authorised:
   Unlimited common shares, no
    par value
   Unlimited preferred shares
    in series, no par value
  Issued:
   74,272,651 (2005 -
    73,964,088) common shares        230,979,873        230,378,934
 Other equity instruments              1,708,309          2,078,460
 Additional paid in capital            4,486,065          2,918,568
 Deficit                            (217,910,587)      (211,698,004)
 ------------------------------------------------------------------
                                      19,263,660         23,677,958
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                                  $   38,460,977     $   44,441,620
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WESTPORT INNOVATIONS INC.
Consolidated Statements of Operations and Deficit
(Expressed in Canadian dollars)

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                                         Three months ended June 30
                                  ---------------------------------
                                            2005               2004
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                                      (Unaudited)        (Unaudited)

Product revenue                   $    7,006,265     $    6,481,235
Parts revenue                          3,507,517          2,342,912
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                                      10,513,782          8,824,147

Cost of revenues and expenses:
 Cost of revenues                      7,804,192          6,524,797
 Research and development              4,927,170          5,033,612
 General and administrative            1,541,931          1,524,872
 Sales and marketing                   1,298,160            942,672
 Foreign exchange loss                    80,473             66,913
 Depreciation and amortisation         1,074,398          1,658,478
 Bank charges and interest                49,468             71,564
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                                      16,775,792         15,822,908
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Loss before undernoted                (6,262,010)        (6,998,761)

Interest and investment income           115,862             90,186

Joint Venture Partner's share of
 income from joint venture               (66,435)                 -
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Loss for the period                   (6,212,583)        (6,908,575)

Deficit, beginning of period
 as reported                        (211,698,004)      (182,996,238)

Cumulative adjustment for
 change in accounting for
 stock-based compensation                      -         (2,493,153)
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Deficit, beginning of period
 as adjusted                        (211,698,004)      (185,489,391)

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Deficit, end of period            $ (217,910,587)    $ (192,397,966)
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Basic and diluted loss per share  $         0.08     $         0.11

Weighted average common
 shares outstanding                   74,036,488         64,670,568

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WESTPORT INNOVATIONS INC.
Consolidated Statements of Cash Flows
(Expressed in Canadian dollars)

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-------------------------------------------------------------------
                                         Three months ended June 30
                                  ---------------------------------
                                            2005               2004
-------------------------------------------------------------------
                                      (Unaudited)        (Unaudited)
Cash provided by (used in):

Operations:
 Loss for the period              $   (6,212,583)    $   (6,908,575)
 Items not involving cash:
  Depreciation and amortisation        1,074,398          1,658,478
  Stock-based compensation expense     1,798,286            257,045
  Accretion of TPC warrants              285,714            285,714
  Change in deferred lease
   inducements                           (30,913)            54,516
  Joint Venture Partner's share of
   income from joint venture              66,435                  -
  -----------------------------------------------------------------
                                      (3,018,663)        (4,652,822)
 Change in non-cash operating
  working capital:
  Accounts receivable                 (1,034,859)         1,257,723
  Inventory                              166,784                  -
  Prepaid expenses                       159,016             57,918
  Accounts payable and accrued
   liabilities                        (1,721,372)          (782,376)
  Deferred revenue                      (100,102)                 -
  Warranty liability                     211,420            289,114
 ------------------------------------------------------------------
                                      (5,337,776)        (3,830,443)
Investments:
 Purchase of equipment, furniture
  and leasehold improvements             (84,762)          (124,612)
 Proceeds on sale of
  short-term investments, net          5,801,438          3,558,859
 ------------------------------------------------------------------
                                       5,716,676          3,434,247
Financing:
 Issue of common shares, net
  of issuance costs                            -            125,681
 Repayment of demand
  instalment loan                       (238,509)          (238,509)
 Repayment of long term-debt
  and other long-term obligations        (39,019)           (61,152)
 ------------------------------------------------------------------
                                        (277,528)          (173,980)
-------------------------------------------------------------------

Increase (decrease) in cash
 and cash equivalents                    101,372           (570,176)

Cash and cash equivalents,
 beginning of period                     319,806          1,436,638
-------------------------------------------------------------------

Cash and cash equivalents,
 end of period                    $      421,178     $      866,462
-------------------------------------------------------------------
-------------------------------------------------------------------

Supplementary information

 Interest paid                    $       26,206     $       49,524
 Non-cash transactions:
  Shares issued on exercise of
   performance share units               600,939          1,003,629
  Shares to be issued on
   acquisition of intellectual
   property                                    -          1,551,426
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Westport Innovations Inc. (TSX:WPT)