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EXHIBIT 10.18

MAY 20, 2002 AMENDMENT TO MUTUAL AGREEMENT BETWEEN MAGNETI
MARELLI USA, INC. AND EDELBROCK CORPORATION

This May 20, 2002 Amendment is entered by and between Magneti Marelli
Powertrain USA, Inc. (Magneti), formerly known as Magneti Marelli USA, Inc.,
and Edelbrock Corporation (Edelbrock) to amend in part, as set forth below
the Mutual Agreement between Magneti Marelli USA, Inc. and Edelbrock
Corporation dated January 1, 2000, (the Agreement), as modified by letters
dated September 20, 1999, November 1, 1999, November 5, 1999 and September 26,
2001.



|1. |  | Paragraph No. 9 of the Agreement shall be deleted and replaced by the
following paragraph:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|   |  | Product Pricing:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|   |  | The products covered by this agreement will be subject to pricing in effect
as of December 31, 1999 to remain in effect until December 31, 2002.
Effective January 1, 2003 and January 1, 2004, prices will be increased by
5% and 3% respectively. For the remaining years of the agreement (CY 2005
through CY 2009) Magneti and Edelbrock will review pricing and take into
consideration manufacturing costs, sales volume and competitive market
condition to ensure this agreement will continue to be mutually beneficial.                                                                                                                                                                                                                                                                                                    
|  
|2. |  | Terms: Terms shall continue to the end of the contract at ninety (90) days from the
ship date of orders covering the period October 1 through March 31 and sixty
(60) days from the ship date of orders covering the period April 1 through
September 30.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|3. |  | Paragraph No. 12 of the Agreement shall be deleted and replaced by the
following paragraph:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|   |  | Other Products: After written notice to Magneti by Edelbrock of its
intention to initiate distribution of any fuel injection system and/or
related accessories into the automotive performance aftermarket other than
the Product and any electronic components including but not limited to ECU
and engine management, Magneti shall have a right of first refusal to become
Edelbrocks exclusive supplier of such product. Magneti must exercise this
right within thirty (30) days of written notice specifying terms and
conditions agreeable to both parties. Such terms and conditions shall be
price competitive with any third party quotations received by Edelbrock. If
Magneti fails to exercise such right, Edelbrock shall have the right to
arrange for procurement of such other product from parties other than
Magneti.

|                                    |  |                                 |  |     |  |                                         
|----------------------------------- |  | ------------------------------- |  | --- |  | ----------------------------------------
|MAGNETI MARELLI POWERTRAIN USA, INC |  | EDELBROCK CORPORATION          
|                                   
|By:                                 |  | FRED GOPAL                      |  | By: |  | O. VICTOR EDELBROCK                     
|                                    |  | Fred Gopal
President and C.E.O. |  |     |  | O. Victor Edelbrock
President and C.E.O.