Security Group 2 PSA Prepayment Assumption Rates Class CA Class CO Class EO Classes OT, TS, TX and XF Distribution Date 0% 100% 180% 250% 400% 0% 100% 180% 250% 400% 0% 100% 180% 250% 400% 0% 100% 180% 250% 400% Initial Percent .................. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 July 2008............................ 92 61 52 52 52 100 100 92 81 57 99 94 86 76 54 100 100 84 83 83 July 2009............................ 92 61 40 40 40 100 100 81 54 1 99 94 76 52 7 100 100 62 59 2 July 2010............................ 92 61 29 29 0 100 100 71 34 0 99 94 67 32 0 100 100 43 38 0 July 2011............................ 92 61 20 20 0 100 100 64 19 0 99 94 60 19 0 100 100 29 23 0 July 2012............................ 92 61 12 12 0 100 100 59 9 0 99 94 55 9 0 100 100 18 12 0 July 2013............................ 92 61 7 7 0 100 100 55 3 0 99 94 51 4 0 100 100 11 4 0 July 2014............................ 92 61 3 3 0 100 100 53 0 0 99 94 49 1 0 100 100 7 0 0 July 2015............................ 92 61 0 0 0 100 100 52 0 0 99 94 47 0 0 100 100 4 0 0 July 2016............................ 92 59 0 0 0 100 100 50 0 0 99 94 46 0 0 100 100 0 0 0 July 2017............................ 92 55 0 0 0 100 100 47 0 0 99 93 44 0 0 100 100 0 0 0 July 2018............................ 92 47 0 0 0 100 100 44 0 0 99 92 41 0 0 100 100 0 0 0 July 2019............................ 92 37 0 0 0 100 100 41 0 0 99 90 38 0 0 100 100 0 0 0 July 2020............................ 92 26 0 0 0 100 100 38 0 0 99 88 35 0 0 100 100 0 0 0 July 2021............................ 92 13 0 0 0 100 100 34 0 0 99 86 31 0 0 100 100 0 0 0 July 2022............................ 92 0 0 0 0 100 100 31 0 0 99 84 28 0 0 100 100 0 0 0 July 2023............................ 92 0 0 0 0 100 92 27 0 0 99 78 25 0 0 100 84 0 0 0 July 2024............................ 92 0 0 0 0 100 84 24 0 0 99 72 22 0 0 100 68 0 0 0 July 2025............................ 92 0 0 0 0 100 76 21 0 0 99 66 19 0 0 100 52 0 0 0 July 2026............................ 92 0 0 0 0 100 68 18 0 0 99 60 17 0 0 100 36 0 0 0 July 2027............................ 92 0 0 0 0 100 60 15 0 0 99 54 14 0 0 100 21 0 0 0 July 2028............................ 92 0 0 0 0 100 52 13 0 0 99 48 12 0 0 100 5 0 0 0 July 2029............................ 92 0 0 0 0 100 45 11 0 0 99 41 10 0 0 100 0 0 0 0 July 2030............................ 92 0 0 0 0 100 38 9 0 0 99 35 8 0 0 100 0 0 0 0 July 2031............................ 92 0 0 0 0 100 31 7 0 0 99 28 6 0 0 100 0 0 0 0 July 2032............................ 92 0 0 0 0 100 24 5 0 0 99 22 5 0 0 100 0 0 0 0 July 2033............................ 49 0 0 0 0 100 17 3 0 0 92 16 3 0 0 100 0 0 0 0 July 2034............................ 0 0 0 0 0 99 11 2 0 0 83 10 2 0 0 98 0 0 0 0 July 2035............................ 0 0 0 0 0 69 5 1 0 0 60 5 1 0 0 37 0 0 0 0 July 2036............................ 0 0 0 0 0 36 0 0 0 0 33 0 0 0 0 0 0 0 0 0 July 2037............................ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   23.9 7.8 2.1 2.1 1.3 28.6 21.5 10.2 2.5 1.1 27.9 19.6 9.5 2.4 1.1 27.8 18.2 3.1 2.7 1.5 PSA Prepayment Assumption Rates Class PA Class PB Class PC Class PO Distribution Date 0% 100% 180% 250% 400% 0% 100% 180% 250% 400% 0% 100% 180% 250% 400% 0% 100% 180% 250% 400% Initial Percent .................. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 July 2008............................ 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 97 86 78 70 55 July 2009............................ 97 84 84 84 84 100 100 100 100 100 100 100 100 100 100 97 86 66 49 15 July 2010............................ 95 69 69 69 58 100 100 100 100 100 100 100 100 100 100 97 86 56 32 0 July 2011............................ 92 54 54 54 29 100 100 100 100 100 100 100 100 100 100 97 86 48 19 0 July 2012............................ 89 41 41 41 7 100 100 100 100 100 100 100 100 100 100 97 86 42 10 0 July 2013............................ 85 28 28 28 0 100 100 100 100 78 100 100 100 100 100 97 86 38 4 0 July 2014............................ 82 16 16 16 0 100 100 100 100 48 100 100 100 100 100 97 86 35 1 0 July 2015............................ 78 4 4 4 0 100 100 100 100 25 100 100 100 100 100 97 86 33 0 0 July 2016............................ 73 0 0 0 0 100 85 85 85 8 100 100 100 100 100 97 85 32 0 0 July 2017............................ 69 0 0 0 0 100 63 63 63 0 100 100 100 100 89 97 84 30 0 0 July 2018............................ 64 0 0 0 0 100 45 45 45 0 100 100 100 100 66 97 81 28 0 0 July 2019............................ 59 0 0 0 0 100 30 30 30 0 100 100 100 100 48 97 77 26 0 0 July 2020............................ 53 0 0 0 0 100 17 17 17 0 100 100 100 100 35 97 73 24 0 0 July 2021............................ 47 0 0 0 0 100 7 7 7 0 100 100 100 100 26 97 69 22 0 0 July 2022............................ 41 0 0 0 0 100 0 0 0 0 100 95 95 95 19 97 64 20 0 0 July 2023............................ 34 0 0 0 0 100 0 0 0 0 100 77 77 77 14 97 59 17 0 0 July 2024............................ 27 0 0 0 0 100 0 0 0 0 100 62 62 62 10 97 54 15 0 0 July 2025............................ 19 0 0 0 0 100 0 0 0 0 100 50 50 50 7 97 49 13 0 0 July 2026............................ 11 0 0 0 0 100 0 0 0 0 100 39 39 39 5 97 44 12 0 0 July 2027............................ 2 0 0 0 0 100 0 0 0 0 100 31 31 31 4 97 39 10 0 0 July 2028............................ 0 0 0 0 0 80 0 0 0 0 100 24 24 24 2 97 34 8 0 0 July 2029............................ 0 0 0 0 0 54 0 0 0 0 100 18 18 18 2 97 29 7 0 0 July 2030............................ 0 0 0 0 0 27 0 0 0 0 100 14 14 14 1 97 24 5 0 0 July 2031............................ 0 0 0 0 0 0 0 0 0 0 93 10 10 10 1 97 20 4 0 0 July 2032............................ 0 0 0 0 0 0 0 0 0 0 14 7 7 7 0 97 15 3 0 0 July 2033............................ 0 0 0 0 0 0 0 0 0 0 5 5 5 5 0 82 11 2 0 0 July 2034............................ 0 0 0 0 0 0 0 0 0 0 3 3 3 3 0 63 7 1 0 0 July 2035............................ 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 44 3 1 0 0 July 2036............................ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 23 0 0 0 0 July 2037............................ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   12.7 4.5 4.5 4.5 3.3 22.1 11.0 11.0 11.0 7.1 24.7 18.9 18.9 18.9 12.8 26.9 16.6 7.3 2.4 1.2 S-19