EXHIBIT 10.6 

**FIRST AMENDMENT TO SECURITY AGREEMENT**

This FIRST AMENDMENT TO SECURITY AGREEMENT (this“Amendment”), dated as of November 6, 2007, is made and given by each of the undersigned (collectively, the “Grantors” and individually, each a “Grantor”), in favor of WB QT, LLC, a Delawarelimited liability company, as agent for the lenders (the “Lenders”) from time to time party to the Credit Agreement defined below (in such capacity, the “Secured Party”). 

**RECITALS**

A. Each Grantor executed infavor of the Secured Party, for the benefit of the Lenders, the Security Agreement dated as of January 31, 2007 (the “Security Agreement”) pursuant to which each Grantor pledged and granted to the Secured Party, for the benefitof the Lenders, a security interest in the property described therein. 

B. The Security Agreement relates to certain indebtedness incurredby Quantum Fuel Systems Technologies Worldwide, Inc., a Delaware corporation (the “Borrower”) pursuant to that certain Credit Agreement, dated as of January 31, 2007, among the Borrower, the Lenders, and the Secured Party, asamended by a First Amendment to Credit Agreement dated as of September 13, 2007 and by a Second Amendment to Credit Agreement dated concurrently herewith (as so amended, the “Credit Agreement”). 

C. Tecstar Automotive Group, Inc. (“Tecstar”) will execute a promissory note in favor of Whitebox Advisors, L.P. in the originalprincipal amount of $5,000,000 (the “Note”), and the Secured Party and the Grantors desire to amend the Security Agreement to secure the obligations of Tecstar under the Note. 

**AGREEMENT**

NOW, THEREFORE, in consideration of the premises and of the mutualcovenants and agreements herein contained, it is agreed as follows: 

1. Defined Terms. Capitalized terms used in this Amendmentwhich are defined in the Security Agreement shall have the same meanings as defined therein, unless otherwise defined herein. 

2.Amendment of Obligations. The definition of “Obligations” contained in Section 1(a) of the Security Agreement is hereby amended in its entirety to read as follows: 

“Obligations” shall mean (a) all indebtedness, liabilities and obligations of each Grantor to the Secured Party orany Lender of every kind, nature or description under the Credit Agreement, including the Borrower’s obligations on any promissory note or notes under the Credit Agreement and any note or notes hereafter issued in 

substitution or replacement thereof, and any other Loan Document (as defined in the Credit Agreement), (b) any and all indebtedness, liabilities andobligations of any Grantor to the Secured Party or any Lender of every kind, nature and description under any Guaranty and any other guaranty or guaranties executed and delivered by such Grantor in favor of the Secured Party, (c) allliabilities of each Grantor under this Agreement, and (d) solely with respect to Tecstar Automotive Group, Inc. (“Tecstar”), all indebtedness, liabilities and obligations of Tecstar to WB QT, LLC of every kind, nature ordescription including without limitation under the promissory note executed by Tecstar in favor of the Secured Party dated as of November 6, 2007 in the original principal amount of $5,000,000, including Tecstar’s obligations on anypromissory note or notes issued in substitution or replacement thereof, in all of the foregoing cases whether due or to become due, and whether now existing or hereafter arising or incurred. 

3. Effectiveness. This Amendment shall be effective as of the date first above written upon the complete execution and delivery (whether byfacsimile or otherwise) thereof. 

4. Affirmation of Security Agreement. The Secured Party and each Grantor each acknowledge andaffirm that the Security Agreement, as amended hereby, is hereby ratified and confirmed in all respects and all terms, conditions and provisions of the Security Agreement, except as amended by this Amendment, shall remain unmodified and in fullforce and effect. All references in any document or instrument to the Security Agreement are hereby amended and shall refer to the Security Agreement as amended hereby. 

5. Successors.****This Amendment shall be binding upon each Grantor, the Secured Party and their respective successors and assigns, and shall inure to the benefit of each Grantor, the Secured Party and thesuccessors and assigns of the Secured Party. 

6. Counterparts. This Amendment may be executed in several counterparts as deemednecessary or convenient, each of which, when so executed, shall be deemed an original, provided that all such counterparts shall be regarded as one and the same document, and any party to this Amendment may execute any such agreement by executing acounterpart of such agreement. 

7. Governing Law.**THIS AMENDMENT SHALL BE GOVERNED BY THE INTERNAL LAWS OF THE STATE OFMINNESOTA, WITHOUT GIVING EFFECT TO CONFLICT OF LAW PRINCIPLES THEREOF.**

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the datefirst written above. 

 
WB QT, LLC, as AgentBy: /s/ Andrew J. RedleafName: Andrew J. RedleafTitle: Director - CEOTECSTAR AUTOMOTIVE GROUP, INC.By: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryQUANTUM FUEL SYSTEMS TECHNOLOGIES WORLDWIDE, INC.By: /s/ W. Brian OlsonName: W. Brian OlsonTitle: CFO
 

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[Signature Page to First Amendment to Security Agreement] 

CLASSIC DESIGN CONCEPTS, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryPERFORMANCE CONCEPTS, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryPOWERTRAIN INTEGRATION, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryREGENCY CONVERSIONS, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: Secretary
 

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[Signature Page to First Amendment to Security Agreement] 

STARCRAFT AUTOMOTIVE GROUP, INC.By: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryTECSTAR, L.P.By: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryTECSTAR PARTNERS, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryTROY TOOLING, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: Secretary
 

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[Signature Page to First Amendment to Security Agreement] 

UNIQUE PERFORMANCE CONCEPTS, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryWHEEL TO WHEEL, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: SecretaryWHEEL TO WHEEL POWERTRAIN, LLCBy: /s/ Kenneth R. LombardoName: Kenneth R. LombardoTitle: Secretary
 

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[Signature Page to First Amendment to Security Agreement]