Exhibit 5.1

KPMG LLP
Chartered Accountants
PO Box 10426 777 Dunsmuir Street
Vancouver BC V7Y 1K3
Canada Telephone
Fax
Internet (604) 691-3000
(604) 691-3031
www.kpmg.ca

Consent of Independent Registered Public Accounting Firm

The Board of Directors
Westport Innovations Inc.

We consent to the use of our report dated May 14, 2009, with respect to the consolidated balance sheets of Westport Innovations Inc. as of March 31, 2009 and 2008 and the related consolidated statements of operations, comprehensive income (loss), shareholders’ equity and cash flows for each of the years in the three-year period ended March 31, 2009, incorporated herein by reference and to the reference to our firm under the heading “Auditors” in the prospectus.

/s/  KPMG LLP

Chartered Accountants

Vancouver, Canada
July 20, 2009

KPMG LLP, a Canadian limited liability partnership is the Canadian
member firm of KPMG International, a Swiss cooperative.