1. Clean Cities Webcast Cummins Westport Gordon Exel

2. Cummins Westport Inc. Business Overview 2005

3. CWI Evolution Old CWI JV Automotive - 6/8L transit, refuse & mid range truck (SI) Automotive - 15L class & heavy duty truck (HPDI) Powergen - 60L low emissions applications New CWI JV Automotive 6-9L transit, refuse & mid range truck (SI) Technology Partnership Cummins + Westport HPDI technology development Westport Demonstration Projects HPDI

4. Worldwide Focus – Leverage International R&D ASIA Mandates increasing GHG concerns Increasing infrastructure development Natural gas consumption increase FOCUS: China, Thailand & Bangladesh, Taiwan, Phillipines ASIA Mandates increasing GHG concerns Increasing infrastructure development Natural gas consumption increase FOCUS: China, Thailand & Bangladesh, Taiwan, Phillipines MEXICO BRAZIL AUSTRALIA CANADA USA AMERICAS Mandates increasing? Strong incentives? Rapidly developing infrastructure Emissions trading potential LNG import growth US Energy security concerns FOCUS: US Non-Attainment Areas, Mexico, Brazil AMERICAS Mandates increasing? Strong incentives? Rapidly developing infrastructure Emissions trading potential LNG import growth US Energy security concerns FOCUS: US Non-Attainment Areas, Mexico, Brazil EUROPE, MIDDLE EAST & INDIA Potential EU Directive GHG reduction focus Growing mandates and incentives Moderate infrastructure development FOCUS: UK, France, Eastern Europe, Egypt, India, Iran, Pakistan EUROPE, MIDDLE EAST & INDIA Potential EU Directive GHG reduction focus Growing mandates and incentives Moderate infrastructure development FOCUS: UK, France, Eastern Europe, Egypt, India, Iran, Pakistan UK FRANCE We are moving the JV to have a truly worldwide focus with specific target countries INDIA CHINA

5. 2000 natural gas buses make it the largest LBSI CNG bus fleet in the world Cummins Westport is currently the sole natural gas engine supplier to Beijing Transport Running 18 hr per day, 7 days per week 90% of 18,000 bus fleet to be operating on “clean engines” by 2008 Olympics Beijing Success Story 400 trained service personnel on Cummins natural gas engines - this is the key to success

6. 2007 Technology

7. Key Characteristics-Diesel vs. NG What Might Be! L 10 GC 8.3C Plus’07 Gas Emissions Better Reliability Worse Similar Fuel Cost/Mile Worse SimilarBetter Durability Worse Similar LCC Worse Better Timeline 1989199620012007

8. Diesel/CNG Pathways to 2010 Diesel ULSD Diesel Particulate Traps EGR Nox Absorber or SCR SCR more efficient but a liquid that will be regulated and taxed Lube Oil –Will require new, more expensive oil Different oil filters –Will require new, more expensive filters Crank Case ventilation absorbed in ’07 –Sensor impact Natural Gas EGR TWC

9. Next Generation Technology Cooled EGR Lower emissions with use of simple passive TWC Higher efficiency with combustion enhancements

10. Three Way Catalyst (as applied to passenger car) EGR Valve LBSI Oxicat Turbo

11. 3-Way Catalyst Simple passive device, like oxidation catalyst Highly effective control of HC, CO, aldehydes, and ultra fine particulates ~95% NOx conversion effectiveness Useful life requirement of 435,000 miles

12. CNG/Diesel/Hybrid LCC & Emissions Comparison

13. Key Assumptions Assumes 25% CNG/Diesel base fuel cost differential Hybrid fuel economy based on GM/Allison promotional material Hybrid continuous technology improvement assumed - both capital and battery life Assumes US transit funded at 83% of initial capital cost (Huge benefit to hybrid LCC) Model assumes diesel penalties for EGR and exhaust aftertreatment Assumes planned gains in efficiency with 2007 CNG technology, and includes all capital and operating costs related to infrastructure requirements

14. NOx Emission Level (g/bhp-hr) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 $0 $500 $1000 $1500 $2000 DieselNOx - Diesel Diesel LCC increases with ULSD, EGR, exhaust aftertreatment efficiency and operating cost penalties Same engine related costs transferred to diesel hybrid Baseline: 2004 Diesel

15. NOx Emission Level (g/bhp-hr) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 $0 $500 $1000 $1500 $2000 DieselHybridNOx - DieselNOx - Hybrid Annual Incremental Capital and Operating Costs - Urban Bus 2004-20062007-20092010+ Hybrid LCC flat due to declining initial cost/battery life benefits offset by diesel cost penalties

16. DieselHybridCWINOx - DieselNOx - HybridNOx - CWI NOx Emission Level (g/bhp-hr) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 $0 $500 $1000 $1500 $2000 Annual Incremental Capital and Operating Costs - Urban Bus 2004-20062007-20092010+ CNG declining LCC - efficiency gains and no complex after treatment costs CNG is now and will continue to be the emissions leader

17. Summary

19. LOWER EMISSONS BEFORE 2010 LOW RISK, PROVEN TECHNOLOGY ENERGY SECURITY EMERGING ECONOMIC BENEFITS

20. Gordon Exel www.cumminswestport.com Cummins Westport Inc. 604 718-8100 www.cumminswestport.com