Cummins Westport ISX12 G Receives 2013 U.S. EPA Certification

        Cummins Westport ISX12 G Receives 2013 U.S. EPA Certification

PR Newswire

VANCOUVER, March 21, 2013

VANCOUVER, March 21, 2013 /PRNewswire/ - Cummins Westport announced today that
it has received certification for its Cummins Westport ISX12 G engine from the
U.S. Environmental Protection Agency (EPA), meeting both the EPA 2013
regulations and the new greenhouse gas and fuel-efficiency rules that will
take effect in 2014. Limited production of the ISX12 G begins in April, with
full production scheduled to start in August.

"With EPA certification, the Cummins Westport ISX12 G engine meets exacting
North American emissions standards," said Jim Arthurs, President, Cummins
Westport. "Our field tests have had good results, and we're pleased to achieve
this important certification milestone. We're truly looking forward to
starting production of this engine next month."

The ISX12 G natural gas engine is based on the Cummins ISX12 diesel engine
platform and operates exclusively on natural gas (compressed natural gas or
liquefied natural gas) utilizing Cummins Westport's proprietary spark-ignited,
stoichiometric combustion with cooled exhaust gas recirculation (SEGR)
technology, first introduced with the Cummins Westport ISL G.

The Cummins Westport ISX12 G will be on display at the Cummins booth at the
Mid-America Trucking Show. It will also be featured in trucks on display by
Freightliner, Kenworth, Mack, Peterbilt, and Volvo.

About Cummins Westport Inc.

Cummins Westport Inc. designs, engineers and markets spark-ignited natural gas
engines for medium- and heavy-duty transportation applications such as trucks
and buses. Cummins Westport 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. (NASDAQ: WPRT/TSX:
WPT), a global leader in alternative fuel, low-emissions technologies that
allow engines to operate on clean-burning fuels such as compressed natural gas
(CNG), liquefied natural gas (LNG), hydrogen and biofuels such as landfill

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 include specifically, statements
regarding the estimated timing for limited and full production of the ISX12 G
engine. These statements are not guarantees of future performance and involve
risks and uncertainties that are difficult to predict, or are beyond Cummins
Westport's control. 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
except as required by applicable securities legislation.

SOURCE Cummins Westport Inc.



Cummins Westport Inc. / Westport Innovations Inc.
Darren Seed
Vice President, Investor Relations & Communications
Phone: 604-718-2046

Cummins Inc.
Jon Mills
External Communications
Phone: 317-658-4540
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