Daimler Trucks North America Introduces Natural Gas Powered Vehicle With
Cummins Westport Engine

VANCOUVER, BRITISH COLUMBIA--(Marketwire - June 11, 2009) - Cummins Westport
Inc. (CWI) (TSX:WPT)(NASDAQ:WPRT), a leading provider of high-performance,
alternative fuel engines for the global market, announced today that Daimler
Trucks North America will offer the ISL G Natural Gas (NG) engine in the
Freightliner Business Class(R) M2 112 truck in a total of six LNG and CNG
tractor/truck configurations. The rollout begins today with an LNG tractor for
port and regional haul applications. The Cummins Westport ISL G, an 8.9 litre
stoichiometric cooled-exhaust gas recirculation (EGR) engine, meets 2010 EPA
emissions today, reduces greenhouse gas emissions and offers top-level
performance and efficiency.

Later in 2009, a CNG version of the tractor is expected to be offered, followed
by CNG single axle tractor, 4X2 and 6X2 truck, and vocational configurations. It
is expected that the entire natural gas offering will be available by the end of
2010.

"Introducing a factory designed and engineered Business Class(R) M2 112 with
natural gas adds to Daimler Trucks' "Shaping Future Transportation" initiative
while we continue to provide our customers a hard-working truck with added
economic and environmental benefits," noted Melissa Claussen, Director of
Marketing, Freightliner Trucks.

Roe East, President of Cummins Westport, added, "This is a great opportunity for
CWI to partner with Freightliner, one of North America's market-leading truck
manufacturers. By launching the Cummins Westport ISL G in the M2 112 tractor,
Freightliner will be able to provide customers with clean, economic natural gas
power for a wide range of applications. By the end of 2010, Freightliner Trucks
expects to have a complete CWI-powered lineup with configuration options for
over 90% of truck applications in North America.

About the Cummins Westport ISL G

The ISL G was the first heavy duty engine to meet EPA 2010 emission standards of
0.2 g/bhp-hr (grams per brake horsepower hour) NOx (nitrogen oxide) and 0.01
g/bhp-hr PM (particulate matter) today. The ISL G leverages Cummins' proven
cooled Exhaust Gas Recirculation (EGR) with stoichiometric combustion allowing
for the use of a three way catalyst, which is maintenance free. No further
aftertreatment is required. The ISL G, with ratings from 250 to 320 horsepower,
also delivers improved fuel economy and over 30% higher low-speed torque
compared with previous CWI "Plus" engines. CWI has already logged significant
orders for the ISL G from Sterling Truck (a Daimler brand) as well as refuse
truck fleets and transit properties. More information about the ISL G can be
found at: www.cumminswestport.com/products/isl... .

About Freightliner Trucks

Freightliner Trucks is a division of Daimler Trucks North America, the largest
manufacturer of heavy-duty vehicles in North America and a leading manufacturer
of medium-duty vehicles. Daimler Trucks North America designs, builds and
markets a wide range of Class 3-8 vehicles including long-haul highway tractors,
heavy-duty construction and vocational trucks, mid-range trucks for distribution
and service, school and transit buses, fire and emergency service apparatus and
chassis for step vans, school and shuttle buses and motor homes.

About Cummins Westport Inc.

Cummins Westport Inc. manufactures and sells the world's widest range of low-
emissions alternative fuel engines for commercial transportation applications
such as trucks and buses. CWI is a joint venture of Cummins Inc. (NYSE:CMI), a
corporation of complementary business units that design, manufacture, distribute
and service engines and related technologies, including fuel systems, controls,
air handling, filtration, emission solutions and electrical power generation
systems, and Westport Innovations Inc. (TSX:WPT)(NASDAQ:WPRT), a leading
developer of technologies that allow engines to operate on clean-burning fuels
such as natural gas, hydrogen, and hydrogen-enriched natural gas (HCNG).
www.cumminswestport.com

Note: This document contains forward-looking statements about Cummins
Westport's business, operations, technology development or to the environment in
which it operates, which are based on Cummins Westport's estimates, forecasts
and projections. These statements are not guarantees of future performance and
involve known and unknown risks and uncertainties that are difficult to predict,
or are beyond Cummins Westport's control and may cause actual results, levels of
activity, performance or achievements to be materially different from any future
results, levels of activities, performance or achievements expressed in or
implied by these forward looking statements. These risks include risks relating
to the timing and availability of Cummins Westport products, and other risk
factors discussed in Westport Innovations Inc. most recent Annual Information
Form and other filings with securities regulators. 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.
Cummins 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.

Inquiries:

Cummins Westport Inc. / Westport Innovations Inc.
Darren Seed
Director, Investor Relations
Phone: 604-718-2046
Email: [email protected]
Web: www.westport.com

Cummins Inc.
Mark Land
Public Relations Director
Phone: 317-610-2456
Email: [email protected]
Web: www.cummins.com