Addendum C to Employment Agreement between Quantum Fuel Systems Technologies Worldwide, Inc. and William Brian Olson (March 15, 2004)

EXHIBIT 10.29

ADDENDUM C TO EMPLOYMENT AGREEMENT

This addendum is made on March 15, 2004 by and between Quantum Fuel Systems Technologies Worldwide, Inc. (herein “Quantum) and William Brian Olson (herein “Employee”). For mutual and adequate exchange of consideration, the parties mutually agree to modify Employee’s Employment Agreement of September 1, 2002, as follows:

Section 2 of the above referenced Employment Agreement is hereby modified via incorporating the following additional language.

“2.1 (a) Effective March 15, 2004, Employee’s base salary is increased to $300,000.00 per year.”