EXHIBIT 23.4



CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM



We consent to the incorporation by reference in the following Registration Statements:



| | (a) | the Registration Statement (Form S-8, No. 33-38649) pertaining to the 1989 Incentive Stock Option Plan of IMPCO Technologies, Inc. and in the related Prospectus;
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| | (b) | the Registration Statement (Form S-8, No. 33-72008) pertaining to the 1991 Executive Stock Option Plan of IMPCO Technologies, Inc. and in the related Prospectus;
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| | (c) | the Registration Statement (Form S-8, No. 33-07035) pertaining to the 1996 Incentive Stock Option Plan of IMPCO Technologies, Inc.;
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| | (d) | the Registration Statement (Form S-8, No. 33-62889) pertaining to the IMPCO Investment and Tax Savings Plan;
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| | (e) | the Registration Statement (Form S-8, No. 333-44085) pertaining to the 1997 Incentive Stock Option Plan of IMPCO Technologies, Inc. and in the related Prospectus;
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| | (f) | the Registration Statement (Form S-8, No. 333-71544) pertaining to the 2000 Incentive Stock Option Plan of IMPCO Technologies, Inc. and in the related Prospectus;
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| | (g) | the Registration Statement (Form S-8, No. 333-102069) pertaining to the IMPCO Technologies, Inc. 2002 Stock Option Plan for Employees and the IMPCO Technologies, Inc. 2002 Stock Option
Plan for Nonemployee Directors and the related Prospectus; and
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| | (h) | the Registration Statement (Form S-8, No. 333-118689) pertaining to the IMPCO Technologies, Inc. 2003 Stock Incentive Plan and the 2004 Stock Incentive Plan and the related Prospectus.
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of our report dated March 5, 2004 with respect to the consolidated
financial statements of BRC S.r.t. as of December 31, 2002 and 2003 included in this Annual Report (Form 10-K) of IMPCO Technologies, Inc. for the year ended December 31, 2005.



/s/ RECONTA ERNST & YOUNG S.P.A.



Milan, Italy

March 27,
2006