Cummins Westport Inc.	Westport Innovations Inc. TSX : WPT

April 11, 2008 09:01 ET

San Diego Metropolitan Transit System Orders 250 Cummins Westport ISL G Engines

VANCOUVER, BRITISH COLUMBIA--(Marketwire - April 11, 2008) - Cummins Westport Inc. ("CWI") (TSX:WPT), a leading provider of high-performance, alternative fuel engines for the global market, announced today that the San Diego Metropolitan Transit System "San Diego MTS" has ordered 250 CWI ISL G engines to be installed in New Flyer, 40-foot, low-floor vehicles.

"San Diego MTS is a repeat customer, has significantly increased its natural gas engine fleet with this order and continues to be a strong advocate for lower emissions," said Gordon Exel, CWI's Vice President and General Manager, Americas. "These new engines will help San Diego MTS to operate one of the cleanest available transit engines. Additionally, the combination of low emission natural gas technology in the CWI ISL G and Cummins' customer support will provide San Diego MTS with robust products and exceptional service."

About the Cummins Westport ISL G

The ISL G surpasses EPA 2007 phase-in levels and meets 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). Based on the Cummins ISL, 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 and is in common use in passenger cars. In addition to delivering ultra-low emissions, the ISL G, with ratings from 250 to 320 horsepower, will deliver increased thermal efficiency and over 30% higher low-speed torque compared with today's CWI "Plus" engines. CWI has already logged significant orders for the ISL G from U.S. transit properties, including Los Angeles Metropolitan Transit Authority, Sacramento Regional Transit and the Orange County Transportation Authority. More information about the ISL G can be found at: www.cumminswestport.com/products/islg.php.

About the San Diego MTS

The San Diego Metropolitan Transit System (MTS) is a multi-modal transportation agency serving San Diego, California and operates a fleet of more than 600 vehicles carrying over 88 million passengers per year. The San Diego MTS was created effective January 26, 1976 to provide the policy setting and overall management coordination of the public transportation system in the San Diego metropolitan service area. This service area encompasses approximately 2.19 million people residing in a 570 square mile area of San Diego County, including the cities of Chula Vista, Coronado, El Cajon, Imperial Beach, La Mesa, Lemon Grove, National City, Poway, Santee, and San Diego and the unincorporated area of the County of San Diego. A number of fixed-route operating entities provide the service and have banded together to form a federation of transit service providers called the Metropolitan Transit System. The purpose of the MTS is to provide coordinated routes, fares, and transfers among the different operating entities. Additional information can be found at www.sdmts.com.

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), 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).

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 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.