IMPCO Detroit Headquarters Letterhead 35715 Sterling Drive Sterling Heights, MI 48312 Tel: (810) 819-0800 Fax: (810) 979-8910 www.impcotechnologies.com AMENDMENT TO THE LEASE BETWEEN KLEIN INVESTMENTS AND IMPCO TECHNOLOGIES, INC. Pursuant to Section...

                                                                   Exhibit 10.18

IMPCO                                                 Detroit Headquarters
Letterhead                                            00000 Xxxxxxxx Xxxxx
                                                      Xxxxxxxx Xxxxxxx, XX 00000
                                                      Tel:  (000) 000-0000
                                                      Fax:  (000) 000-0000
                                                      xxx.xxxxxxxxxxxxxxxxx.xxx


                AMENDMENT TO THE LEASE BETWEEN XXXXX INVESTMENTS
                          AND IMPCO TECHNOLOGIES, INC.

Pursuant to Section 12.1 of the lease between Xxxxx Investments and IMPCO
Technologies, IMPCO Technologies Inc. assigns this lease to Quantum
Technologies, Inc., a wholly-owned subsidiary of IMPCO Technologies, as of
October 31, 2000 with the consent of Xxxxx Investments. In return for acceptance
of this assignment IMPCO Technologies, Inc. will guaranty performance of all
terms and conditions under this lease by Quantum Technologies, Inc. to Xxxxx
Investments.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment by their
officers thereunto duly authorized as of the day and year first written above.


IMPCO Technologies, Inc.                     Xxxxx Investments

By: /s/ Xxx Xxxxxxx                          BY: /s/ Xxxxxxx X. Xxxxx
    ---------------------------                  --------------------
    Xxx Xxxxxxx, 2-8-2001

TITLE:  VP & Secretary                       TITLE: General Partner
                                                    -----------------


Quantum Technologies, Inc.

BY: /s/ Xxxx Xxxxxxx
    ----------------------


TITLE: President
       -------------------