If the related Mortgage Loans prepay at rates that are generally above the Effective Range for any PAC or Scheduled Class, its supporting Classes and Components may be retired earlier than that PAC or Scheduled  Class, and its Weighted Average Life may be shortened, perhaps significantly. Assumability Each Mortgage Loan may be assumed, subject to HUD review and approval, upon the sale of the related Mortgaged Property. See "Yield, Maturity and Prepayment Considerations – Assumability of Government Loans" in the Base Offering Circular. Final Distribution Date The Final Distribution Date for each Class, which is set forth on the inside cover page of this Supplement or on Schedule I to this Supplement, is the latest date on which the related Class Principal Balance or Class Notional Balance will be reduced to zero. •   The actual retirement of any Class may occur earlier than its Final Distribution Date. •   According to the terms of the Ginnie Mae Guaranty, Ginnie Mae will guarantee payment in full of the Class Principal Balance of each Class of Securities no later than its Final Distribution Date. Modeling Assumptions Unless otherwise indicated, the tables that follow have been prepared on the basis of the characteristics of the Underlying Certificates, the priorities of distributions on the Underlying Certificates and the following assumptions (the "Modeling Assumptions"), among others: 1.  The Mortgage Loans underlying the Group 1, 2, 5 and 6 Trust Assets have the assumed characteristics shown under "Assumed Characteristics of the Mortgage Loans Underlying the Group 1, 2, 5 and 6 Trust Assets" in the Terms Sheet, except in the case of information set forth under the 0% PSA Prepayment Assumption Rate, for which each Mortgage Loan underlying a Group 1, 2, 5 and 6 Trust Asset is assumed to have an original and a remaining term to maturity of 360 months, and each Mortgage Loan underlying a Group 2 Trust Asset is assumed to have a Mortgage Rate of 1.50% per annum higher than the related Certificate Rate. 2.  The  Mortgage  Loans  prepay  at  the  constant  percentages  of  PSA  (described  below) shown in the related table. 3.  Distributions on the Group 1, 5 and 6 Securities are always received on the 16th day of the month, distributions on the Group 4 and 12 Securities are always received on the 17th day of the month and distributions on the Groups 2, 3, 7, 8, 9, 10, 11 and 13 Securities are always received  on  the  20th  day  of  the  month,  in  each  case,  whether  or  not  a  Business  Day, commencing in June 2004. 4.  A termination of the Trust or the Underlying Trusts does not occur. 5.  The Closing Date for the Securities is May 28, 2004. 6.  No expenses or fees are paid by the Trust other than the Trustee Fee. 7.  Distributions  on  the  Underlying  Certificates  are  made  as  described  in  the  related Underlying Certificate Disclosure Documents. 8.  Each Class is held from the Closing Date and is not exchanged in whole or in part. When  reading  the  tables  and  the  related  text,  investors  should  bear  in  mind  that  the Modeling Assumptions, like any other stated assumptions, are unlikely to be entirely consistent with actual experience. S-22