Security Group 2 PSA Prepayment Assumption Rates Class AB Class AC Class AD Class AE Distribution Date 0% 100%  175%   300%    400% 0% 100%  175%   300%    400% 0% 100%  175%   300%    400% 0% 100%  175%   300%    400% Initial Percent ..................     100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 May 2005  ..........................    100 100 99 84 62 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 May 2006  ..........................    100 100 94 12 0 100 100 100 100 0 100 100 100 100 77 100 100 100 100 100 May 2007  ..........................    100 100 74 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 87 0 May 2008  ..........................    100 100 58 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2009  ..........................    100 100 46 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2010  ..........................    100 100 37 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2011  ..........................    100 100 27 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2012  ..........................    100 100 19 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2013  ..........................    100 100 15 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2014  ..........................    100 100 9 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2015  ..........................    100 100 2 0 0 100 100 100 0 0 100 100 100 0 0 100 100 100 0 0 May 2016  ..........................    100 100 0 0 0 100 100 88 0 0 100 100 100 0 0 100 100 100 0 0 May 2017  ..........................    100 100 0 0 0 100 100 71 0 0 100 100 100 0 0 100 100 100 0 0 May 2018  ..........................    100 100 0 0 0 100 100 53 0 0 100 100 100 0 0 100 100 100 0 0 May 2019  ..........................    100 99 0 0 0 100 100 35 0 0 100 100 100 0 0 100 100 100 0 0 May 2020  ..........................    100 98 0 0 0 100 100 17 0 0 100 100 100 0 0 100 100 100 0 0 May 2021  ..........................    100 90 0 0 0 100 100 0 0 0 100 100 98 0 0 100 100 100 0 0 May 2022  ..........................    100 71 0 0 0 100 100 0 0 0 100 100 21 0 0 100 100 100 0 0 May 2023  ..........................    100 52 0 0 0 100 100 0 0 0 100 100 0 0 0 100 100 77 0 0 May 2024  ..........................    100 34 0 0 0 100 100 0 0 0 100 100 0 0 0 100 100 47 0 0 May 2025  ..........................    100 16 0 0 0 100 100 0 0 0 100 100 0 0 0 100 100 19 0 0 May 2026  ..........................    100 0 0 0 0 100 96 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2027  ..........................    100 0 0 0 0 100 61 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2028  ..........................    100 0 0 0 0 100 27 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2029  ..........................    100 0 0 0 0 100 0 0 0 0 100 72 0 0 0 100 100 0 0 0 May 2030  ..........................    100 0 0 0 0 100 0 0 0 0 100 0 0 0 0 100 66 0 0 0 May 2031  .......................... 96 0 0 0 0 100 0 0 0 0 100 0 0 0 0 100 4 0 0 0 May 2032  .......................... 47 0 0 0 0 100 0 0 0 0 100 0 0 0 0 100 0 0 0 0 May 2033  .......................... 0 0 0 0 0 38 0 0 0 0 100 0 0 0 0 100 0 0 0 0 May 2034  .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................    27.9   19.1 5.3 1.5 1.1 28.9 23.3 14.2 2.5 1.8 29.3 25.2 17.6 2.9 2.0 29.5 26.3 20.0 3.2 2.2 PSA Prepayment Assumption Rates Class AG Class AH Class AK Class AL Distribution Date 0% 100%  175%   300%    400% 0% 100%  175%   300%    400% 0% 100%  175%   300%    400% 0% 100%  175%   300%    400% Initial Percent ..................     100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 May 2005  ..........................    100 100 100 100 100 100 100 99 69 23 100 100 100 100 100 100 100 100 100 100 May 2006  ..........................    100 100 100 100 100 100 100 88 0 0 100 100 100 32 0 100 100 100 100 0 May 2007  ..........................    100 100 100 100 0 100 100 47 0 0 100 100 100 0 0 100 100 100 0 0 May 2008  ..........................    100 100 100 3 0 100 100 15 0 0 100 100 100 0 0 100 100 100 0 0 May 2009  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 92 0 0 100 100 100 0 0 May 2010  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 77 0 0 100 100 100 0 0 May 2011  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 58 0 0 100 100 100 0 0 May 2012  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 44 0 0 100 100 100 0 0 May 2013  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 36 0 0 100 100 100 0 0 May 2014  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 26 0 0 100 100 100 0 0 May 2015  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 13 0 0 100 100 100 0 0 May 2016  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 0 0 0 100 100 97 0 0 May 2017  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 0 0 0 100 100 49 0 0 May 2018  ..........................    100 100 100 0 0 100 100 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2019  ..........................    100 100 100 0 0 100 98 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2020  ..........................    100 100 100 0 0 100 96 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2021  ..........................    100 100 100 0 0 100 79 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2022  ..........................    100 100 100 0 0 100 41 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2023  ..........................    100 100 100 0 0 100 4 0 0 0 100 100 0 0 0 100 100 0 0 0 May 2024  ..........................    100 100 100 0 0 100 0 0 0 0 100 70 0 0 0 100 100 0 0 0 May 2025  ..........................    100 100 100 0 0 100 0 0 0 0 100 38 0 0 0 100 100 0 0 0 May 2026  ..........................    100 100 95 0 0 100 0 0 0 0 100 6 0 0 0 100 100 0 0 0 May 2027  ..........................    100 100 78 0 0 100 0 0 0 0 100 0 0 0 0 100 22 0 0 0 May 2028  ..........................    100 100 62 0 0 100 0 0 0 0 100 0 0 0 0 100 0 0 0 0 May 2029  ..........................    100 100 47 0 0 100 0 0 0 0 100 0 0 0 0 100 0 0 0 0 May 2030  ..........................    100 100 34 0 0 99 0 0 0 0 100 0 0 0 0 100 0 0 0 0 May 2031  ..........................    100 100 23 0 0 92 0 0 0 0 100 0 0 0 0 100 0 0 0 0 May 2032  ..........................    100 59 13 0 0 0 0 0 0 0 94 0 0 0 0 100 0 0 0 0 May 2033  ..........................    100 17 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 May 2034  .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................    29.8   28.2    25.1 3.7 2.4 27.6 17.7 3.0 1.2 0.8 28.3 20.6 8.0 1.9 1.4 28.8 22.7 13.0 2.3 1.7 S-25