Analyst Day [1] Strategic Overview

The global leader in natural gas engines.Strategic OverviewWestport Innovations Inc. 1

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

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

Leverage TechnologyAcross Broad End-Market Applications passenger cars light-duty trucks forklifts school / shuttle transit buses / wastehaulers vocational trucks delivery vans buses motorcoaches heavy heavy-duty vocational long-haul trucks trucks resource extraction (mine-haul) industrial transport (locomotives) marine cryogenic fuel storage, delivery and transportation 4

Business Structure Public Co, Advanced Technology, Westport Corporate & Strategic New Market Creation, Investment Programs M&A, pre-commercial programs including Weichai, Volvo, GM, HHP LTM Investment ($25.6) m(1) Product Sales Divisions Profitable since Rapid evolution key metrics: 2004 Emerging; P&L, sales growth rates, Emer acquisition LTM EBITDA* 1st revenue 2008 market penetration, 07/2011 $20.4 m LTM EBITDA* position LTM EBITDA* Revenue CAGR ($16.5) m ($2.7) m 28%(1) Last Twelve Months ended June 30, 2011, NET adjusted EBITDA is $24.4M . 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) interest expense, net,(d) amortization of stock-based compensation, (e) income (loss) from unconsolidated joint ventures and (f) gains.

Global Operations Vancouver Lyon Canada Beijing & Weifang France China Signal Hill Detroit Pernumia & Brescia U.S.A. U.S.A. Italy Bayswater Australia 6

Transportation Energy DemandsCanada and USA natural gasfuel consumption by vehicleclass (74 billion ft3/day) CNG & LPG 32 billion ft3/day 25 billion ft3/day 14 billion ft3/day 4 billion ft3/day CNG & LNG LNG source: 2007 EIA, NRCan 7

Dividing up The Incremental Value Price differential between natural gas and diesel can be split between: Distribution of Fuel Cost Savings  End-User (cheaper fuel, lower overall $180 cost per mile, better competitive $160 position) $140 Fuel cost $B annually  Vehicle OEM (increased price and $120 margin %) $100  Tech Provider – (new entrant to $80 market so a new piece) $60  Integrator and Services (LNG, new $40 integration services, logistics) $20  Natural gas producer (new, high $0 Diesel value market) and LNG increment Experience suggests it will take a while for a stable model to emerge Source: Westport analysis, customer interviews, industry publications, and OEM survey

The global leader in natural gas engines.Thank you.Enjoy your day with Westport! 9

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Analyst Day [1] Strategic Overview

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