EXHIBIT
32.2
CERTIFICATION
PURSUANT TO
18
U.S.C. §1350,
AS
ADOPTED PURSUANT TO
SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002
In
connection with the Quarterly Report of U.S. Auto Parts Network, Inc. (the
“Company”) on Form 10-Q for the quarter ended June 30, 2008 as filed with the
Securities and Exchange Commission on the date hereof (the “Report”), I, Michael
J. McClane, Chief Financial Officer of the Company, certify, pursuant to 18
U.S.C. §1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, that:
1. The
Report fully complies with the requirements of Section 13(a) or 15(d) of
the Securities Exchange Act of 1934; and
2. The
information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company.
Date:
August 13, 2008
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/s/
MICHAEL J. McCLANE
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Michael
J. McClane
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Chief
Financial Officer
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A signed
original of this written statement required by Section 906, or any other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the electronic version of this written statement
required by Section 906, has been provided to the Company and will be
retained by the Company and furnished to the Securities and Exchange Commission
or its staff upon request.