Document:

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                                                                    Exhibit 10.8

                                                                   June 21, 2004

Transportation Resource Partners, L.P.
2555 Telegraph Road
Bloomsfield Hills, MI 48302

Ladies and Gentlemen:

This letter will confirm our agreement that, in connection with your investment
in Micron Holdings, Inc. (the "Company"), Transportation Resource Partners,
L.P., a Delaware limited partnership ("Investor") will be entitled to the
following contractual management rights relating to the Company, Titan Holdings,
Inc. ("Titan") and Autocam Corporation ("Autocam") (collectively, the
"Management Rights"):

      1.    Investor shall be entitled to routinely consult with and advise
            management of the Company, Titan and Autocam and their direct and
            indirect subsidiaries with respect to operations of the Company,
            Titan and Autocam and their direct and indirect subsidiaries,
            including all the business and financial matters of each of them and
            management's proposed annual operating plans, and management will
            meet regularly during each year with representatives of Investor
            (the "Representatives") at the Company's, Titan's or Autocam's
            facilities at mutually agreeable times for such consultation and
            advice, including to review progress in achieving said plans. The
            Company, Titan and Autocam shall give Investor reasonable advance
            written notice of any significant new initiatives or material
            changes to existing operating plans of the Company, Titan and
            Autocam and their direct and indirect subsidiaries and shall afford
            Investor adequate time to meet with management to consult on such
            initiatives or changes prior to implementation. The Company, Titan
            and Autocam and their direct and indirect subsidiaries agree to give
            due consideration to the advice given and any proposals made by
            Investor;

      2.    Investor may inspect all documents, contracts, books, records,
            personnel, offices and other facilities and properties of the
            Company, Titan and Autocam and their direct and indirect
            subsidiaries and, to the extent available to the Company, Titan and
            Autocam after the use of reasonable efforts to obtain them, the
            records of their legal advisors and accountants, including the
            accountants' work papers, and Investor may make such copies and
            inspections thereof as Investor may reasonably request. The Company,
            Titan and Autocam shall furnish Investor with such financial and
            operating data and other information with respect to the business
            and properties of the Company, Titan and Autocam and their direct
            and indirect subsidiaries as Investor may request. The Company,
            Titan and Autocam

<PAGE>

            and their direct and indirect subsidiaries shall permit the
            Representatives to discuss their affairs, finances and accounts
            with, and to make proposals and furnish advice with respect thereto,
            the principal officers of the Company, Titan and Autocam and their
            direct and indirect subsidiaries;

      3.    The Company shall deliver to Investor:

            (a)   as soon as available and in any event within 45 days after the
                  end of each of the first three quarters of each fiscal year of
                  the Company, consolidated balance sheets of the Company and
                  its direct and indirect subsidiaries as of the end of such
                  period then ended, and consolidated statements of income and
                  cash flows of the Company and its direct and indirect
                  subsidiaries for the period then ended, in each case prepared
                  in conformity with generally accepted accounting principles in
                  the United States applied on a consistent basis, except as
                  otherwise noted therein and subject to the absence of
                  footnotes and to year-end adjustments;

            (b)   as soon as available and in any event within 120 days after
                  the end of each fiscal year of the Company, a consolidated
                  balance sheet of the Company and its direct and indirect
                  subsidiaries as of the end of such year, and consolidated
                  statements of income and cash flows of the Company and its
                  direct and indirect subsidiaries for the year then ended, in
                  each case prepared in conformity with generally accepted
                  accounting principles in the United States applied on a
                  consistent basis, except as otherwise noted therein, together
                  with an auditor's report thereon of a firm of established
                  national reputation; and

            (c)   to the extent the Company or any direct or indirect subsidiary
                  is required by law or pursuant to the terms of any outstanding
                  indebtedness of the Company or any direct or indirect
                  subsidiary to prepare such reports, any annual reports,
                  quarterly reports and other periodic reports pursuant to
                  Section 13 or 15(d) of the Securities Exchange Act of 1934
                  actually prepared by the Company or any direct or indirect
                  subsidiary as soon as available.

      Investor agrees, and shall cause each of its Representatives to agree, to
hold in confidence and trust and not use or disclose any confidential
information provided to or learned by it in connection with the exercise of
Investor's Management Rights under this letter agreement, unless otherwise
required by law or unless such confidential information otherwise becomes
publicly available or available to it other than through this letter agreement.

                                      -2-
<PAGE>

      The rights set forth in this letter agreement, together with the rights of
Investor set forth in the Stockholders' Agreement, dated as of June 21, 2004, by
and among the Company, Investor, and certain other parties (collectively,
"Rights"), are intended to satisfy the requirement of contractual management
rights for purposes of qualifying Investor's interest in the Company as a
venture capital investment for purposes of the Department of Labor's "plan
assets" regulations, and in the event that, after the date hereof, as a result
of any change in applicable law or regulation or a judicial or administrative
interpretation of applicable law or regulation, it is determined that such
Rights are not satisfactory for such purpose, Investor and the Company shall
reasonably cooperate in good faith to agree upon mutually satisfactory
management rights which satisfy such regulations.

                            [signature page follows]

                                      -3-
<PAGE>

                                    Very truly yours,

                                    Micron Holdings, Inc.

                                    By:    /s/ John C. Kennedy
                                           _________________________________
                                    Name:  _________________________________
                                    Title: _________________________________

                                    Titan Holdings, Inc., a Delaware corporation

                                    By:    /s/ John C. Kennedy
                                           _________________________________
                                    Name:  _________________________________
                                    Title: _________________________________

                                    Autocam Corporation, a Michigan corporation

                                    By:    /s/ John C. Kennedy
                                           _________________________________
                                    Name:  _________________________________
                                    Title: _________________________________

AGREED AND ACCEPTED THIS
___ day of June, 2004

Transportation Resource Partners, L.P.

By:  /s/ James Hislop
     __________________________
Its: __________________________

                                      -4-<PAGE>
                                                                    Exhibit 10.9

                                                                   June 21, 2004

GS Private Equity Partners 2002 -
Direct Investment Fund, L.P.
32 Old Slip, 21st Floor
New York, NY  10005
Attn:  Kiele Neas

GS Private Equity Partners II -
Direct Investment Fund, L.P.
32 Old Slip, 21st Floor
New York, NY  10005
Attn:  Kiele Neas

GS Private Equity Partners 1999 -
Direct Investment Fund, L.P.
32 Old Slip, 21st Floor
New York, NY  10005
Attn:  Kiele Neas

Ladies and Gentlemen:

This letter will confirm our agreement that, in connection with each of your
investments in Micron Holdings, Inc. (the "Company"), each of GS Private Equity
Partners 2002 - Direct Investment Fund, L.P., GS Private Equity Partners II -
Direct Investment Fund, L.P. and GS Private Equity Partners 1999 - Direct
Investment Fund, L.P. (each, an "Investor") will be entitled to the following
contractual management rights relating to the Company, Titan Holdings, Inc.
("Titan") and Autocam Corporation ("Autocam") (collectively, the "Management
Rights"):

      1.    Each Investor shall be entitled to routinely consult with and advise
            management of the Company, Titan and Autocam and their direct and
            indirect subsidiaries with respect to operations of the Company,
            Titan and Autocam and their direct and indirect subsidiaries,
            including all the business and financial matters of each of them and
            management's proposed annual operating plans, and management will
            meet regularly during each year with representatives of each
            Investor (the "Representatives") at the Company's, Titan's or
            Autocam's facilities at mutually agreeable times for such
            consultation and advice, including to review progress in achieving
            said plans. The Company, Titan and Autocam shall give each Investor

<PAGE>

      reasonable advance written notice of any significant new initiatives or
      material changes to existing operating plans of the Company, Titan and
      Autocam and their direct and indirect subsidiaries and shall afford each
      Investor adequate time to meet with management to consult on such
      initiatives or changes prior to implementation. The Company, Titan and
      Autocam and their direct and indirect subsidiaries agree to give due
      consideration to the advice given and any proposals made by each Investor;

2.    Each Investor may inspect all documents, contracts, books, records,
      personnel, offices and other facilities and properties of the Company,
      Titan and Autocam and their direct and indirect subsidiaries and, to the
      extent available to the Company, Titan and Autocam after the use of
      reasonable efforts to obtain them, the records of their legal advisors and
      accountants, including the accountants' work papers, and each Investor may
      make such copies and inspections thereof as such Investor may reasonably
      request. The Company, Titan and Autocam shall furnish each Investor with
      such financial and operating data and other information with respect to
      the business and properties of the Company, Titan and Autocam and their
      direct and indirect subsidiaries as such Investor may request. The
      Company, Titan and Autocam and their direct and indirect subsidiaries
      shall permit the Representatives to discuss their affairs, finances and
      accounts with, and to make proposals and furnish advice with respect
      thereto, the principal officers of the Company, Titan and Autocam and
      their direct and indirect subsidiaries;

3.    The Company shall deliver to each Investor:

      (a)   as soon as available and in any event within 45 days after the end
            of each of the first three quarters of each fiscal year of the
            Company, consolidated balance sheets of the Company and its direct
            and indirect subsidiaries as of the end of such period then ended,
            and consolidated statements of income and cash flows of the Company
            and its direct and indirect subsidiaries for the period then ended,
            in each case prepared in conformity with generally accepted
            accounting principles in the United States applied on a consistent
            basis, except as otherwise noted therein and subject to the absence
            of footnotes and to year-end adjustments;

      (b)   as soon as available and in any event within 120 days after the end
            of each fiscal year of the Company, a consolidated balance sheet of
            the Company and its direct and indirect subsidiaries as of the end
            of such year, and consolidated statements of income and cash flows
            of the Company and its direct and indirect subsidiaries for the year
            then ended, in each case prepared in conformity with generally
            accepted accounting principles in the United States applied on a
            consistent basis, except as otherwise noted

                                      -2-
<PAGE>

            therein, together with an auditor's report thereon of a firm of
            established national reputation; and

      (c)   to the extent the Company or any direct or indirect subsidiary is
            required by law or pursuant to the terms of any outstanding
            indebtedness of the Company or any direct or indirect subsidiary to
            prepare such reports, any annual reports, quarterly reports and
            other periodic reports pursuant to Section 13 or 15(d) of the
            Securities Exchange Act of 1934 actually prepared by the Company or
            any direct or indirect subsidiary as soon as available.

      Each Investor agrees, and shall cause each of its Representatives to
agree, to hold in confidence and trust and not use or disclose any confidential
information provided to or learned by it in connection with the exercise of such
Investor's Management Rights under this letter agreement, unless otherwise
required by law or unless such confidential information otherwise becomes
publicly available or available to it other than through this letter agreement.

      The rights set forth in this letter agreement are intended to satisfy the
requirement of contractual management rights for purposes of qualifying each
Investor's interest in the Company as a venture capital investment for purposes
of the Department of Labor's "plan assets" regulations, and in the event that,
after the date hereof, as a result of any change in applicable law or regulation
or a judicial or administrative interpretation of applicable law or regulation,
it is determined that such Rights are not satisfactory for such purpose, the
Company and each Investor shall reasonably cooperate in good faith to agree upon
mutually satisfactory management rights which satisfy such regulations.

                            [signature pages follow]

                                      -3-
<PAGE>

                                   Very truly yours,

                                   Micron Holdings, Inc.

                                   By: /s/ John C. Kennedy
                                      ----------------------------
                                   Name:
                                         -------------------------
                                   Title:
                                         -------------------------

                                   Titan Holdings, Inc., a Delaware corporation

                                   By: /s/ John C. Kennedy
                                      ----------------------------
                                   Name:
                                         -------------------------
                                   Title:
                                         -------------------------

                                   Autocam Corporation, a Michigan corporation

                                   By: /s/ John C. Kennedy
                                      ----------------------------
                                   Name:
                                         -------------------------
                                   Title:
                                         -------------------------

                           [signature page continues]

                                      -4-
<PAGE>

AGREED AND ACCEPTED THIS
___ day of June, 2004

GS Private Equity Partners 2002 - Direct Investment Fund, L.P.
By: GS PEP 2002 Direct Investment Advisors, L.L.C., General Partner
By: GSAM Gen-Par, L.L.C., Managing Partner

/s/ Leonard Nero
_______________________
Leonard Nero
Vice President

AGREED AND ACCEPTED THIS
___ day of June, 2004

GS Private Equity Partners II - Direct Investment Fund, L.P.
By: GS PEP II Direct Investment Advisors, L.L.C., General Partner
By: GSAM Gen-Par, L.L.C., Managing Partner

/s/ Leonard Nero
_______________________
Leonard Nero
Vice President

AGREED AND ACCEPTED THIS
___ day of June, 2004

GS Private Equity Partners 1999 - Direct Investment Fund, L.P.
By: GS PEP 1999 Direct Investment Advisors, L.L.C., General Partner
By: GSAM Gen-Par, L.L.C., Managing Partner

/s/ Leonard Nero
_______________________
Leonard Nero
Vice President

                                      -5-

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