June 2018

1. June 2018
Corporate
Presentation

2. PAGE 2
750+
Patents/
Applications
$247M
2017
Revenue
>100
Distributors
14
Offices &
facilities
70
Countries
customers
served
THE WORLD OF WESTPORT FUEL SYSTEMS
Note: Approximate number of employees and products as of December 31, 2017; worldwide granted patents and pending applications for Westport Fuel
Systems companies as of June 5, 2018.
Broad Applications Alternative Fuels
Key Priorities
> Broaden product offering
> Deploy market-ready
solutions
> Continue to focus on cash
management
> Increase engagement with
key OEMs and industry
partners
Driving innovation to power a cleaner tomorrow
1300
Employees
Locations
Renewable Fuels

3. PAGE 3
MARKET DYNAMICS
Macro trends are driving rapid change within transportation sector
> Alternative fuels competing for market share
> Incumbents innovate in response to regulationCompetitive Landscape
Sustainability
Considerations
> Fleet and customer demand for lower-carbon fuels
> Well-to-wheel analysis of fuel impacts
Economic Pressures
> Compelling fuel price differential
> Must offer improved Total Cost of Ownership (TCO)
Technology Evolution
> Innovation driving differentiation
> CO2 emissions legislation requires increased fuel economy
Stringent Regulatory
Frameworks
> Increased anti diesel sentiment
> Renewable energy mandates and low
carbon fuel standards

4. PAGE 4
WESTPORT FUEL SYSTEMS STRATEGY
Business model sets company on a sustainable path forward
> LPG/CNG kits and components for aftermarket vehicle conversions
and DOEM
> Components & systems for Tier 1 OEM supply in LPG and CNG,
including Engine Management Systems & Engine Controllers
ready for latest emission regulations
> Spark ignited products for transit, refuse & speciality vehicles
> Westport HPDI 2.0™, the LNG solution for heavy-duty trucking
> Long history & deep technology innovation and engineering capabilities
> Strong intellectual property position
> Existing and applied for patents covering CNG, LNG, and LPG
components & systems worldwide
> Significant investment in research and development for gaseous fuelled
transportation applications
Market-Ready Solutions Leading Technology Position
Diverse Product and Brand Portfolio – for a variety of applications and markets

5. PAGE 5
KEY AREAS OF FOCUS
> Broaden product offering
> Deploy market-ready solutions
> Build “back to basics” manufacturing excellence initiatives
> Reduce R&D spend
> Increase engagement with key OEMs and industry partners
TRANSPORTATION SEGMENT
OVERVIEW
> Aftermarket, delayed OEM, or fully integrated OEM alternative
fuel solutions
> Systems, EMS, engine controllers, components and CNG refueling
for passenger cars, commercial vehicles, & trucks
> Westport HPDI 2.0™ LNG fuel system
> Technologies include HPDI, spark-ignited, cryogenics, & electronics
MARKET LEADING PRODUCTS
64%
15%
14%
7%
2017
% Sales
(by destination)
Europe
Americas
Asia
Other
Historical Financials

6. PAGE 6
MARKET LEADING PRODUCTS
CUMMINS WESTPORT JOINT VENTURE
> 50% ownership of Cummins Westport Inc. (“CWI”)
> Develops and sells 5.9-12.0 litre spark-ignited natural
gas engines for medium- to heavy-duty engine markets
> “Move to Zero” emissions strategy offers performance and
reliability at an ultra-low emissions level, available TODAY
> Continue growth in refuse trucks and bus markets, as well
as trucking
> Reduce R&D spend following the launch of the Near Zero
and 2018 OBD compliant natural gas engines
KEY AREAS OF FOCUS
OVERVIEW
CWI Financial Highlights
• refuse
trucks
• buses • trucks
($ in millions) 2017 2016
Better/
(Worse)
Revenue $ 317.3 $ 276.5 15%
R&D 30.7 36.1 15%
Dividends 16.6 10.2 63%

7. PAGE 7
CORPORATE SEGMENT
> Continued cash management initiatives to position the
company to be agile to changing customer and market
demands
> Responsible for public company activities, corporate oversight and general administrative duties
> Corporate R&D expenses related to costs associated with protecting, managing, and building intellectual property portfolio
KEY AREAS OF FOCUS
OVERVIEW
HISTORICAL FINANCIALSLeading Premier Technology Position
Source: Westport Fuel Systems patent database; worldwide granted patents and pending applications for Westport Fuel Systems companies as of June 5, 2018.
29%
20%
18%
16%
9%
8%
HPDI On-Engine
Control Systems
Cryogenics
Spark-Ignited Direct Injection
Other Technology
Aftermarket Components
Patent Portfolio
Total >750
Patents/applications

8. PRODUCT PORTFOLIO
> Components & Complete Systems
> Delayed OEM Solutions
> Westport HPDI 2.0™
> Hydrogen Solutions

9. PAGE 9
> Components and complete
systems
> Light-duty applications –
vapor and liquid LPG
> Monofuel, bi-fuel, dual fuel
solutions
> The most commonly used
alternative fuel in the world
ALTERNATIVE FUEL CAPABILITIES
Compressed
Natural Gas
Liquefied Petroleum
Gas / Propane /
Autogas / BioLPG
Liquefied
Natural Gas
Hydrogen
Renewable Fuels
Substitute for fossil based fuels
Broad Range of Products that Deliver Emission Reductions
> Components and
complete systems
> Light- and medium-duty
applications
> Monofuel, bi-fuel, dual
fuel solutions
> Complete systems
> Heavy-duty and high
horsepower applications
> Monofuel and dual fuel
solutions
> High and low pressure
components available
> Light- to heavy-duty and
industrial applications
> Hydrogen/CNG blends or
pure hydrogen
LPG CNG LNG H2

10. PAGE 10
COMPONENTS & COMPLETE SYSTEMS
Complete Product Lines for Various Fuels and Markets
Light-Duty
Aftermarket OEM
> Valves / filling valves
> Pressure regulators
> Electronic control unit
> Preformed pipes
> Other CNG-system related components
> LPG and CNG systems
 Electronic control unit
 Gas injectors
 Shut off valve
 Tank and filling valves
 Filters
 Pressure regulators

11. PAGE 11
Medium-Duty
Heavy-Duty
COMPONENTS & COMPLETE SYSTEMS
Complete Product Lines for Various Fuels and Markets
On-Engine Off-Engine
> Valves / filling valves
> Regulators
> Preformed pipes
> Tanks racks
> HP filters
> Injection rails
> ECUs
Complete Systems
> On- & Off-engine components
> Engine Management Systems
l

12. PAGE 12
DELAYED OEM SOLUTIONS Light-Duty
Honda
> Turkey
> LPG
> Bi-fuel
> Civic ECO
Fiat Chrysler
> West Europe
> LPG
> Bi-fuel
> RAM 1500
Other D-OEMs
Kia
> Italy
> LPG
> Bi-fuel
> Multiple models
Hyundai
> Italy
> LPG
> Bi-fuel
> Multiple models

13. PAGE 13
Heavy-Duty
OEM Engine
FULLY INTEGRATED WESTPORT HPDI 2.0™ TRUCK SOLUTION
On Engine On Chassis On LNG Tank
HPDI Control
Software
Tank Selection
Control Manifold
Gas Temperature
Sensor
Integrated Gas Module
LNG Pump
Control Manifold
Fuel Level Signal
CANditioner
Cryogenic High
Pressure Pump
High Pressure
Direct Injector
Gas Rail
LNG Tank
Module
Gas
Conditioning
Module
(GCM)

14. PAGE 14
WESTPORT HPDI COMMERCIALIZATION
Fuel Prices / litre by Country2
Highlights
€ 0.84
€ 0.91
€ 0.93
€ 0.94
€ 0.98
€ 1.00
€ 1.02
€ 1.03
€ 1.09
€ 1.10
€ 1.12
€ 1.14
€ 0.55
€ 0.46
€ 0.54
€ 0.42
€ 0.61
€ 0.65
€ 0.70
€ 0.56
€ 0.97
€ 0.63
€ 0.54
€ 0.80
Poland
Spain
Czech Republic
Germany
Netherlands
Portugal
Finland
Belgium
Sweden
France
Italy
Switzerland
LNG
Diesel
Significant Milestone for the Company
> Westport HPDI 2.0™ launched in Q4 2017
> Westport Fuel Systems is a Tier 1 supplier
with a fully integrated solution
> Europe initial target market due to demand
for GHG reduction and higher diesel prices
> 15-50 month payback periods expected in
some markets1
> Growing LNG infrastructure in Europe
> Active discussions with multiple OEMs
> New programs expected to be funded by
3rd parties and will build on existing
Westport HPDI 2.0™ technology
1. See payback calculations on page 24-25 in the appendix
2. Source: www.globalpetroprices as of November 6, 2017

15. PAGE 15
HYDROGEN SOLUTIONS
Components and Systems for Various Applications
> Integrated tank valve regulator
(H-ITVR)
> Tank valve
> PRD
> Regulator
> Manual tank valve
> Tank valve
> Pressure relief device (PRD) with
temperature sensor
> Regulator
> Pressure control module
> Pressure relief valve
> Shut off valve
Transportation Industrial
Light-, Medium-,
Heavy-Duty, Industrial
Complete hydrogen fuel system solutions from high pressure tank valves
to low pressure electronic fuel pressure control at fuel cell

16. FINANCIAL
OVERVIEW

17. PAGE 17
> Operating expenses and net income improvement
> On track for positive adjusted EBITDA during Q2 2018
WFS CONSOLIDATED RESULTS
^Adjusted EBITDA is a non-GAAP number
($ in millions) Q1 2018 Q1 2017 Q2 2017 Q3 2017 Q4 2017
Total Revenues $ 67.6 $ 60.0 $ 62.1 $ 60.8 $ 64.2
Gross Margin 15.3 17.5 15.8 14.8 16.1
GM% 23% 29% 25% 24% 25%
Operating Expenses 26.4 29.5 32.1 34.9 32.6
Net Loss from Continuing
Operations (12.7) (12.8) (13.3) (15.7) (19.2)
Adjusted EBITDA^ (3.5) (4.1) (5.3) (5.0) (3.5)
FIRST QUARTER SEQUENTIAL

18. PAGE 18
> Increase in sales due to appreciation of the Euro, launch of Westport HPDI 2.0™ and European
aftermarket demand
> Decline in R&D expense with the launch of Westport HPDI 2.0™
TRANSPORTATION SEGMENT
^Adjusted EBITDA is a non-GAAP number
($ in millions) Q1 2018 Q1 2017 Q2 2017 Q3 2017 Q4 2017
Total Revenues $ 67.6 $ 60.0 $ 62.1 $ 60.8 $ 64.2
Gross Margin 15.3 17.5 15.8 14.8 16.1
GM% 23% 29% 25% 24% 25%
R&D 8.7 11.6 13.9 12.9 11.4
SG&A 9.3 10.6 10.1 11.8 11.3
Adjusted EBITDA^ (0.6) (2.4) (5.8) (8.7) (4.0)
Adjusted EBITDA %^ (0.9%) (4.0%) (9.3%) (14.3%) (6.2%)
FIRST QUARTER SEQUENTIAL

19. PAGE 19
> Lower Q1 2018 sales due to pre-buy activity in Q4 2017 and OEM vehicle readiness
> Gross margins impacted by lower revenues and an unfavorable warranty adjustment in Q1 2018 compared to
a favorable adjustment in Q1 2017
CUMMINS WESTPORT INC.
FIRST QUARTER
($ in millions) Q1 2018 Q1 2017 Q2 2017 Q3 2017 Q4 2017
Units 819 1740 2037 1780 2398
Total Revenues $ 52.2 $ 70.7 $ 79.5 $ 75.5 $ 91.6
Gross Margin 13.2 21.8 28.6 27.9 31.2
GM% 25% 31% 36% 37% 25%
R&D 6.1 10.98 7.2 7.6 5.1
% of sales 12% 15% 9% 10% 6%
SG&A 4.1 5.8 5.0 5.3 4.7
% of sales 8% 8% 6% 7% 5%
Net income 3.0 3.5 10.6 11.6 (0.7)
% of sales 6% 5% 13% 15% (1%)
SEQUENTIAL

20. PAGE 20
> Ongoing R&D expenses related to costs associated with protecting the Company’s intellectual property
> SG&A expenses related to public company activities, corporate oversight and general administrative
functions
CORPORATE SEGMENT
($ in millions) Q1 2018 Q1 2017 Q2 2017 Q3 2017 Q4 2017
R&D $ 0.2 $ 0.3 $ 0.3 $ 0.2 $ 0.4
SG&A 5.3 4.6 5.9 4.4 5.8
Total 5.5 4.9 6.2 4.6 6.2
FIRST QUARTER SEQUENTIAL

21. PAGE 21
Lower R&D spending
CWI performance
WFS POSITIVE EARNINGS TREND
Adjusted EBITDA is a non GAAP measure. A complete reconciliation of adjusted EBITDA can be seen in the MD&A.
Income & Adjusted EBITDA
Key Drivers
-96.8
-83.9
-39.8 -44.4
-17.9
-3.5
-194.2
-158.7
-110.3
-124.7
-64.9
-11.1
-200.0
-180.0
-160.0
-140.0
-120.0
-100.0
-80.0
-60.0
-40.0
-20.0
0.0
20.0
40.0
2013 2014 2015 2016 2017 2018
$Millions
Adjusted EBITDA Income from Operations
Q1
2018

22. APPENDIX

23. PAGE 23
> From 25 stations in 2012
> To ~150 in operation in 2018
> And over 400 stations planned to
be in operation by 2021*
LNG STATION GROWTH IN EUROPE
Source: NGVA Europe, Westport analysis, January 2018
Existing stations
Planned stations
* based on projects announced as of Jan 2018

24. PAGE 24
> 2,640 LNG gas stations in
China in 2016, an increase
of 9% from 2015
 Shandong province:
295 stations
 Hebei province:
240 stations
 Xinjiang province:
198 stations
LNG STATION GROWTH IN CHINA
Source: http://www.lngche.com/article-5560-1.html, http://jqz.lngche.com/plugin.php?id=dzcms_map
Xinjiang
198
Hebei
240
Shandong
295

25. PAGE 25
In Various Countries
WESTPORT™ HPDI PAYBACK ANALYSIS
FOR ILLUSTRATIVE PURPOSES ONLY
Incremental Truck Cost for HPDI *
Country A Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI
Diesel Fuel Cost/liter € 1.49 € 1.49 € 1.49 € 1.49 € 1.49 € 1.49 € 1.49 € 1.49 € 1.49 € 1.49
LNG Fuel Cost/DLE** € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76
Annual distance (km) 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000
Diesel Liters used per year 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182
LNG DLE** used - 34,178 - 34,178 - 34,178 - 34,178 - 34,178
Annual Fuel Cost € 53,640 € 29,226 € 53,640 € 29,226 € 53,640 € 29,226 € 53,640 € 29,226 € 53,640 € 29,226
Annual Fuel Cost Savings € 24,414 € 24,414 € 24,414 € 24,414 € 24,414
Payback Period (months)
Incremental Truck Cost for HPDI *
Country B Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI
Diesel Fuel Cost/liter € 1.27 € 1.27 € 1.27 € 1.27 € 1.27 € 1.27 € 1.27 € 1.27 € 1.27 € 1.27
LNG Fuel Cost/DLE** € 0.62 € 0.62 € 0.62 € 0.62 € 0.62 € 0.62 € 0.62 € 0.62 € 0.62 € 0.62
Annual distance (km) 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000
Diesel Liters used per year 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182
LNG DLE** used - 34,178 - 34,178 - 34,178 - 34,178 - 34,178
Annual Fuel Cost € 45,720 € 23,962 € 45,720 € 23,962 € 45,720 € 23,962 € 45,720 € 23,962 € 45,720 € 23,962
Annual Fuel Cost Savings € 21,759 € 21,759 € 21,759 € 21,759 € 21,759
Payback Period (months)
€ 35,000 € 40,000 € 45,000 € 50,000 € 60,000
19.3 22.1 24.8 27.6 33.1
€ 35,000 € 40,000 € 45,000 € 50,000 € 60,000
17.2 19.7 22.1 24.6 29.5
FOR ILLUSTRATIVE PURPOSES ONLY
NOTE: ALL PRICES WILL BE SET BY THE OEM ** DLE = Diesel Liter Equivalent
Source: Fuel price data from www.globalpetroprices.com and Westport Fuel Systems analysis

26. PAGE 26
Incremental Truck Cost for HPDI *
Country C Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI
Diesel Fuel Cost/liter € 1.50 € 1.50 € 1.50 € 1.50 € 1.50 € 1.50 € 1.50 € 1.50 € 1.50 € 1.50
LNG Fuel Cost/DLE** € 0.70 € 0.70 € 0.70 € 0.70 € 0.70 € 0.70 € 0.70 € 0.70 € 0.70 € 0.70
Annual distance (km) 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000
Diesel Liters used per year 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182
LNG DLE** used - 34,178 - 34,178 - 34,178 - 34,178 - 34,178
Annual Fuel Cost € 54,000 € 27,198 € 54,000 € 27,198 € 54,000 € 27,198 € 54,000 € 27,198 € 54,000 € 27,198
Annual Fuel Cost Savings € 26,802 € 26,802 € 26,802 € 26,802 € 26,802
Payback Period (months)
Incremental Truck Cost for HPDI *
Country D Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI Diesel HPDI
Diesel Fuel Cost/liter € 1.12 € 1.12 € 1.12 € 1.12 € 1.12 € 1.12 € 1.12 € 1.12 € 1.12 € 1.12
LNG Fuel Cost/DLE** € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76 € 0.76
Annual distance (km) 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000 120,000
Diesel Liters used per year 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182 36,000 2,182
LNG DLE** used - 34,178 - 34,178 - 34,178 - 34,178 - 34,178
Annual Fuel Cost € 40,320 € 28,419 € 40,320 € 28,419 € 40,320 € 28,419 € 40,320 € 28,419 € 40,320 € 28,419
Annual Fuel Cost Savings € 11,901 € 11,901 € 11,901 € 11,901 € 11,901
Payback Period (months)
€ 35,000 € 40,000 € 45,000 € 50,000 € 60,000
35.3 40.3 45.4 50.4 60.5
€ 35,000 € 40,000 € 45,000 € 50,000 € 60,000
15.7 17.9 20.1 22.4 26.9
In Various Countries
WESTPORT™ HPDI PAYBACK ANALYSIS
FOR ILLUSTRATIVE PURPOSES ONLY
FOR ILLUSTRATIVE PURPOSES ONLY
NOTE: ALL PRICES WILL BE SET BY THE OEM ** DLE = Diesel Liter Equivalent
Source: Fuel price data from www.globalpetroprices.com and Westport Fuel Systems analysis

27. THINKING AHEAD
> www.wfsinc.com