Security Group 3 PSA Prepayment Assumption Rates Classes MB and MI Class MD Class MZ Distribution Date 0% 100% 203% 325% 450% 0% 100% 203% 325% 450% 0% 100% 203% 325% 450% Initial Percent ..................    100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 October 2008.................... 99 91 83 74 64 100 100 100 100 100 106 106 106 106 106 October 2009.................... 97 81 66 49 34 100 100 100 100 100 112 112 112 112 112 October 2010.................... 95 71 51 30 12 100 100 100 100 100 118 118 118 118 118 October 2011.................... 93 62 38 15 0 100 100 100 100 92 125 125 125 125 125 October 2012.................... 92 54 27 2 0 100 100 100 100 66 132 132 132 132 132 October 2013.................... 90 46 17 0 0 100 100 100 83 47 139 139 139 139 139 October 2014.................... 87 39 8 0 0 100 100 100 65 33 147 147 147 147 102 October 2015.................... 85 32 1 0 0 100 100 100 51 24 155 155 155 155 72 October 2016.................... 82 26 0 0 0 100 100 87 40 17 164 164 164 122 51 October 2017.................... 80 20 0 0 0 100 100 74 31 12 173 173 173 96 37 October 2018.................... 77 14 0 0 0 100 100 63 25 8 183 183 183 75 26 October 2019.................... 74 9 0 0 0 100 100 54 19 6 193 193 163 58 18 October 2020.................... 70 4 0 0 0 100 100 45 15 4 204 204 137 45 13 October 2021.................... 67 0 0 0 0 100 98 38 11 3 216 216 116 35 9 October 2022.................... 63 0 0 0 0 100 88 32 9 2 228 228 97 27 6 October 2023.................... 59 0 0 0 0 100 78 27 7 1 241 237 81 20 4 October 2024.................... 54 0 0 0 0 100 69 22 5 1 254 210 67 15 3 October 2025.................... 49 0 0 0 0 100 61 18 4 1 269 185 55 12 2 October 2026.................... 44 0 0 0 0 100 53 15 3 0 284 161 45 9 1 October 2027.................... 39 0 0 0 0 100 46 12 2 0 300 138 36 6 1 October 2028.................... 33 0 0 0 0 100 39 9 2 0 304 117 28 5 1 October 2029.................... 26 0 0 0 0 100 32 7 1 0 304 98 22 3 0 October 2030.................... 20 0 0 0 0 100 26 5 1 0 304 79 17 2 0 October 2031.................... 12 0 0 0 0 100 20 4 1 0 304 62 12 2 0 October 2032.................... 5 0 0 0 0 100 15 3 0 0 304 45 8 1 0 October 2033.................... 0 0 0 0 0 91 10 2 0 0 278 30 5 1 0 October 2034.................... 0 0 0 0 0 71 5 1 0 0 215 16 3 0 0 October 2035.................... 0 0 0 0 0 49 1 0 0 0 149 2 0 0 0 October 2036.................... 0 0 0 0 0 25 0 0 0 0 77 0 0 0 0 October 2037.................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   16.4 6.0 3.4 2.2 1.6 27.9 19.9 13.7 9.3 6.7 27.9 21.3 16.3 11.9 9.0 PSA Prepayment Assumption Rates Class VM Class VN Distribution Date 0% 100% 203% 325% 450% 0% 100% 203% 325% 450% Initial Percent ..................    100 100 100 100 100 100 100 100 100 100 October 2008.................... 93 93 93 93 93 100 100 100 100 100 October 2009.................... 86 86 86 86 86 100 100 100 100 100 October 2010.................... 78 78 78 78 78 100 100 100 100 100 October 2011.................... 70 70 70 70 39 100 100 100 100 100 October 2012.................... 61 61 61 61 0 100 100 100 100 55 October 2013.................... 52 52 52 0 0 100 100 100 93 3 October 2014.................... 43 43 43 0 0 100 100 100 42 0 October 2015.................... 32 32 32 0 0 100 100 100 1 0 October 2016.................... 22 22 0 0 0 100 100 82 0 0 October 2017.................... 10 10 0 0 0 100 100 43 0 0 October 2018.................... 0 0 0 0 0 99 99 7 0 0 October 2019.................... 0 0 0 0 0 91 91 0 0 0 October 2020.................... 0 0 0 0 0 82 82 0 0 0 October 2021.................... 0 0 0 0 0 72 66 0 0 0 October 2022.................... 0 0 0 0 0 62 31 0 0 0 October 2023.................... 0 0 0 0 0 52 0 0 0 0 October 2024.................... 0 0 0 0 0 41 0 0 0 0 October 2025.................... 0 0 0 0 0 29 0 0 0 0 October 2026.................... 0 0 0 0 0 17 0 0 0 0 October 2027.................... 0 0 0 0 0 3 0 0 0 0 October 2028.................... 0 0 0 0 0 0 0 0 0 0 October 2029.................... 0 0 0 0 0 0 0 0 0 0 October 2030.................... 0 0 0 0 0 0 0 0 0 0 October 2031.................... 0 0 0 0 0 0 0 0 0 0 October 2032.................... 0 0 0 0 0 0 0 0 0 0 October 2033.................... 0 0 0 0 0 0 0 0 0 0 October 2034.................... 0 0 0 0 0 0 0 0 0 0 October 2035.................... 0 0 0 0 0 0 0 0 0 0 October 2036.................... 0 0 0 0 0 0 0 0 0 0 October 2037.................... 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  .................. 6.0 6.0 5.6 4.4 3.5 16.0 14.2 9.9 6.9 5.1 S-22