The global leader in natural gas engines, Westport, held a shareholder meeting on April 12, 2012. The presentation provided an overview of Westport, including its focus on transforming engines from petroleum-fueled to alternative-fueled using its natural gas technology. It also summarized Westport's business structure, products, key partnerships and joint ventures, financial highlights, and investment opportunities as the pure-play global leader in natural gas fuel systems.

1. The global leader in natural gas engines.
Westport Shareholder Meeting
12 April 2012
1

2. Forward Looking Statements
 This presentation contains forward-looking statements that are based on the beliefs of Westport’s
management and reflect Westport’s current expectations. Investors are cautioned that all forward-
looking statements involve risks and uncertainties that could cause actual results to differ
materially from those expressed in these forward-looking statements, including, without limitation,
Westport’s ability to develop viable fuel systems; Westport’s ability to provide the capital required
for research, product development, operations, and marketing; product development, production
and commercial launch delays; changing environmental regulations; Westport’s ability to attract
and retain key personal and business partners; competition from conventional diesel fuelled
engines; and Westport’s ability to protect its intellectual property. These factors should be
considered carefully and investors should not rely on any forward-looking statements. Investors
are encouraged to review Management’s Discussion and Analysis and the Risk Factors section in
Westport’s most recently filed Annual Information Form and filings with securities regulators for a
more complete discussion of factors that could affect Westport’s future performance. We
undertake no obligation to update or revise any forward-looking statements, whether as a result of
new information, future events or otherwise, except as required by law.
 All figures are in U.S. dollars unless otherwise stated.
2

3. Westport at a Glance
market focus position strategy
Leverage IP to penetrate
Transformation from The global leader in
markets through
petroleum-fueled to gaseous fuel engineering
relationships with market-
alternative-fueled engines. and technology. leading OEMs.
Volvo
3

4. Business Structure
strategic programs
mergers & acquisitions, (public company)
pre-commercial
Advanced Technology, New Market Creation
programs
(Weichai, Volvo, GM, LTM Investment ($42.5) m1
HHP, etc.)
Emerging, Rapid evolution
product sales (joint venture)
1st revenue 2008
divisions Profitable since 2004 Emer acquisition July
Commercial launch 2011
Key Metrics: Revenue CAGR 29% March 2011
profit & loss, last twelve months last twelve months last twelve months
sales growth rates, units5,465 units 274 revenues $66.7m
market penetration, revenues $163.9m revenues $34.1m gross margin $13.8m
position gross margin $71.5m gross margin $12.7m R&D $4.0m
R&D $11.6m R&D $20.9m EBITDA* ($2.2m)
EBITDA* $34.5m EBITDA* ($22.1m)
1 Last Twelve Months ended December 31, 2011, NET adjusted EBITDA is ($34.4m) . See financial overview slide # 16 for further details.
* The Company defines Adjusted EBITDA as net loss attributed to the Company before (a) income taxes, (b) depreciation and amortization, (c) 4
interest expense, net, (d) amortization of stock-based compensation, (e) income (loss) from unconsolidated joint ventures and (f) gains.

5. “The Golden Age of Natural Gas”
World natural gas resources by major region, January 2010 (tcm)
source: “Are We Entering a Golden Age of Gas?”, IEA, June 2011. 5

6. Downward Pressure on Natural Gas Prices
Natural gas price projections are significantly lower than past years due to an
expanded shale gas resource base
natural gas spot price (Henry Hub); 2009 dollars per million Btu
10
$9/MMBtu
9
8
updated
AEO2009 AEO2010 $7/MMBtu
7
6
5
AEO2011
4
3
Current
2
price:
1 $2.20
history 2009 projections
0
1990 1995 2000 2005 2010 2015 2020 2025 2030 2035
sources: EIA, Annual Energy Outlook 2011; EIA, Annual Energy Outlook 2010; and EIA, An Updated Annual Energy Outlook 2009 Reference Case
via: Shale Gas and the Outlook for U.S. Natural Gas Markets and Global Gas Resources, Richard Newell, June 21, 2011 6

7. Rest of the World:
136 billion US
Total World Diesel Consumption gallons/year
Europe:
North America: 94 billion US
77 billion US gallons/year China:
gallons/year
41 billion US
gallons/year
road transport
India:
rail transport These segments have
16 billion US
engines that consume large
misc. industry & gallons/year
amounts of fuel and benefit
construction from HPDI’s diesel-like
inland & coastal performance characteristics
waterways
source: UN Energy Statistics Database, United Nations Statistics Division
(UNSD) 2008. Westport analysis.
7

8. Transportation Energy Demands
Canada and USA natural gas fuel consumption by vehicle class (74 billion ft3/day)
32 billion
ft3/day 25 billion
ft3/day
14 billion 4 billion
ft3/day ft3/day
source: 2007 EIA, NRCan 8

9. What Worked:
Urban Return-to-Base Commercial Fleets
Mumbai Vancouver
Las Vegas Los Angeles
9

10. Cummins Westport Business Model
10

11. Weichai Westport Joint-Venture Business Model
FYE Dec. 31, USD$MM 2008 2009 2010 2011
Hong Kong
Peterson (CNG) Revenue $ 9.9 $ 19.0 $ 44.8 $ 109.8
Equipment
35% Cost of revenue 8.1 15.7 35.9 90.1
25% 40% Expenses 1.6 2.5 6.4 14.1
Net income $ 0.1 $ 0.8 $ 2.4 $ 5.6
% margin 1.3% 4.2% 5.4% 5.1%
WPT 35% interest* - - $ 0.6 $ 1.9
* Westport began reporting its income from WWI since July 2010
$110 9,000
YTD Revenue Engine Sales
$100 8,000
 JV first announced 2008; formal 7,000
$80
JV commenced July 2010 6,000
$ million
Units
 Existing natural gas engine $60 5,000
$45 4,000
business demonstrating strong $40
3,000
growth in China $19 2,000
$20
$10
 Target: Dominate Asian market; 1,000
$- -
future export potential 2008 2009 2010 2011
11

12. New Products: From Consumers to HD Trucking
Volvo Cars Ford Trucks
12

13. LD
Complete Solution: Westport Light-Duty
off-engine on-engine complete
components components engines
13

14. HD
The Westport HD System
Natural gas engines with diesel-equivalent Fuel injectors only
performance, range and change to engine
efficiency.
HPDI fuel injectors
LNG tank &
pump module
Complete LNG fuel
solution including Proprietary high-pressure
proprietary tanks direct injection (HPDI)
and fuel pumps technology
14

15. HD
Leading Global Market Position
Heavy-Duty Truck Manufacturers (working with Westport)
North America Europe China India
1. Daimler Group 1. Volvo + Renault (24%) 1. FAW (22%) 1. Tata (70%)
(Freightliner, Western 2. Daimler (21%) 2. Sinotruck (19%) 2. Ashok Leyland (19%)
Star) (34%)
3. MAN (16%) 3. DongFeng (18%) 3. Force Motors (5%)
2. International (25%)
4. DAF (16%) 4. Shanxi Automobile 4. Asia Motor Works
3. PACCAR (Peterbilt, (11%) (4%)
Kenworth) (23%) 5. Scania (14%)
5. Beijing Automotive 5. Volvo Global Trucks
4. Volvo Group (Volvo (10%) (1%)
Truck, Mack) (18%)
6. Others (27%)
source: NADA, Class 8 trucks for 2010 source: www.acea.be, HCV-Heavy source: Morgan Stanley Truck & Engine source: Morgan Stanley Truck & Engine
Commercial Vehicles (Trucks) over 16t for Chartbook, September 30, 2010 Chartbook, September 30, 2010
2010
Broad Set of
Relationships Creates
Global Footprint Volvo
15

16. HD
Fueling a Truck for Range & Capability
base location
Return-to-base or
hub and spoke scenario Consolidating key value
chain components such as:
base location satellite location satellite location  fuel supply
 customer support
 comprehensive
maintenance
into a single, user-friendly
package
Point-to-point scenario
16

17. HD
Infrastructure Corridors
Corridors ranked by
diesel consumption
#11 #9 #3
#7
Salt Lake
City
#5
Las
Vegas
Los #6
#10 #12 #4
Angeles
#1
Dallas
#8
San
Antonio Houston
#2
17

18. HD
Infrastructure Corridors (Dec. 2012 Projected)
source: Clean Energy Fuels
18

19. HHP
New Markets
mine haul trucks shale frac trucks & pumps
tugboats industrial locomotives
19

20. HHP
Significant High-Horsepower Opportunities
target vehicles current issues engine OEMs
MINING
(RESOURCE EXTRACTION) 2bn gal of diesel consumed annually by the top 10
mine haul mining companies alone1 with 28,600 large mine haul
trucks trucks (>100 ton capacity) operating around the world2
drill rigs and 2,035 onshore drilling rigs working in U.S. and
frac pumps Canada3 with estimates of the pressure pumping
horsepower in North America set to top 10mn hp in
20114
RAIL diesel
mainline Rail industry consumes 9bn gal of diesel fuel annually,
freight half of this in North America5
locomotives Fuel represents approximately 24% of US railroad
diesel operating costs6
passenger
locomotives
MARINE ferries
Marine industry consumes 13bn gal of diesel fuel
annually5
tugboats Emissions reduction in sensitive coastal and inland
PSVs waterways are a priority
work and Some examples of LNG ferries and platform support
crew boats vessels (PSV) in Scandinavia, but no widespread
adoption yet
1.Westport analysis 4.United Holdings investor information presentation 2011
2.Morgan Stanley/Parker Bay 5.UN Energy Statistics Database 2008 20
3.Baker Hughes report, August 2010 6.Burlington Northern 2008 Annual Report

21. Financial Overview
21

22. Financial Highlights
Ended Dec 31st, Y/Y Y/Y
USD$MM Q4 CY11 Q4 CY10 Change CY11 CY10 Change
$61.1 $120.3
Revenue $100.6 $39.5 $264.7 $144.4
+155% +83%
$26.7 $47.4
Gross margin $39.6 $12.9 $98.3 $50.9
+207% +93%
Gross margin % 39% 33% - 37% 35% -
~$330M in cash & short-term investments*
YTD = year to date
*as at February 29, 2012 22
Y/Y = year over year

23. Revenue Segmentation & Growth
CY 2010
Revenue: $144.4 Q3 FY2010 to Dec 31, 2010
Cummins
Westport Revenue: $39.5M
81% Cummins
Westport
79% Westport
Westport HD
8% Westport LD Westport LD 20%
11% HD 1%
Q3 FY2011 to Dec 31, 2011
CY 2011
Revenue: $100.6M
Cummins
Westport Revenue: $264.7 Cummins
62% Westport
57%
Westport
HD
Westport HD 20%
13% Westport
Westport LD
LD 23%
25%
23

24. Summary Financial Overview
Revenue $264.7 Gross Profit $98.3
$50.9
$144.4
$32.7 Margin
$103.5 $108.2 $24.1 $26.9
34% 35% 37%
$71.0 26%
30%
CY 2007 CY 2008 CY 2009 CY 2010 CY 2011 CY 2007 CY 2008 CY 2009 CY 2010 CY 2011
63% 59% 56% 62% 59% 60%
Geographic Breakdown Americas
17% 18% 17%
14% 16% 20% Asia
23% 24% 26% 22% 24% 20% Rest of World
(for the quarters ended…)
Jun 10 Sep 10 Dec 10 Mar 11 Jun 11 Dec 11
(all dollar values are in millions of U.S. dollars) 24

25. Investment Highlights
Pure-play global leader for gaseous fuel
storage, delivery, and combustion technologies.
Capital
Valuable Talented &
Strong First- Efficient &
Strategic & Experienced
Mover Scalable
Business Management
Advantage Business
Alliances Team
Model
25