Percentages of Original Class Principal (or Class Notional) Balances and Weighted Average Lives Security Group 1 PSA Prepayment Assumption Rates Classes FE, FH, FM and IM Classes FG, PO, SG and SP Class FN Distribution Date 0% 150% 297% 450% 600% 0% 150% 297% 450% 600% 0% 150% 297% 450% 600% Initial Percent ..................     100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 August 2008...................... 99 96 94 91 88 99 96 94 91 89 100 100 100 100 100 August 2009...................... 98 89 81 73 65 98 89 82 74 66 100 100 100 100 100 August 2010...................... 97 80 65 52 40 97 81 66 53 42 100 100 100 100 100 August 2011...................... 96 71 52 36 24 96 72 54 38 27 100 100 100 100 100 August 2012...................... 95 64 42 25 14 95 65 44 28 17 100 100 100 100 100 August 2013...................... 94 57 33 17 8 94 58 35 20 11 100 100 100 100 100 August 2014...................... 92 50 26 11 4 92 52 28 14 7 100 100 100 100 100 August 2015...................... 91 45 20 7 1 91 46 23 10 4 100 100 100 100 100 August 2016...................... 89 39 16 4 0 89 41 18 7 3 100 100 100 100 82 August 2017...................... 87 35 12 2 0 88 37 15 5 2 100 100 100 100 52 August 2018...................... 85 30 9 1 0 86 33 12 4 1 100 100 100 100 32 August 2019...................... 83 27 7 0 0 84 29 10 3 1 100 100 100 83 20 August 2020...................... 81 23 5 0 0 82 26 8 2 0 100 100 100 59 12 August 2021...................... 79 20 3 0 0 79 22 6 1 0 100 100 100 41 8 August 2022...................... 76 17 2 0 0 77 20 5 1 0 100 100 100 29 5 August 2023...................... 73 14 1 0 0 74 17 4 1 0 100 100 100 20 3 August 2024...................... 70 12 0 0 0 71 15 3 0 0 100 100 93 14 2 August 2025...................... 67 10 0 0 0 68 13 2 0 0 100 100 73 10 1 August 2026...................... 63 8 0 0 0 64 11 2 0 0 100 100 56 7 1 August 2027...................... 59 6 0 0 0 60 9 1 0 0 100 100 43 5 0 August 2028...................... 55 5 0 0 0 56 8 1 0 0 100 100 33 3 0 August 2029...................... 50 4 0 0 0 52 7 1 0 0 100 100 25 2 0 August 2030...................... 45 2 0 0 0 47 5 1 0 0 100 100 18 1 0 August 2031...................... 40 1 0 0 0 42 4 0 0 0 100 100 13 1 0 August 2032...................... 34 0 0 0 0 36 3 0 0 0 100 100 9 1 0 August 2033...................... 28 0 0 0 0 30 3 0 0 0 100 80 6 0 0 August 2034...................... 21 0 0 0 0 23 2 0 0 0 100 55 4 0 0 August 2035...................... 13 0 0 0 0 16 1 0 0 0 100 34 2 0 0 August 2036...................... 5 0 0 0 0 8 0 0 0 0 100 14 1 0 0 August 2037...................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   20.2 8.6 5.2 3.7 2.9 20.5 9.2 5.7 4.0 3.2 29.8 27.3 20.3 14.3 10.7 Security Group 2 PSA Prepayment Assumption Rates Class FD Classes FJ and JI Distribution Date 0% 100% 247% 300% 500% 0% 100% 247% 300% 500% Initial Percent ..................     100 100 100 100 100 100 100 100 100 100 August 2008......................    100 100 92 89 77 98 95 95 95 95 August 2009......................    100 100 75 66 34 96 87 87 87 87 August 2010......................    100 100 56 42 0 94 76 76 76 73 August 2011......................    100 100 42 25 0 92 67 67 67 50 August 2012......................    100 100 32 13 0 90 58 58 58 35 August 2013......................    100 100 26 5 0 87 49 49 49 24 August 2014......................    100 100 21 1 0 85 41 41 41 16 August 2015......................    100 100 19 0 0 82 34 34 34 11 August 2016......................    100 99 18 0 0 79 27 27 27 8 August 2017......................    100 97 16 0 0 76 22 22 22 5 August 2018......................    100 93 15 0 0 72 17 17 17 4 August 2019......................    100 89 13 0 0 69 14 14 14 2 August 2020......................    100 84 12 0 0 65 11 11 11 2 August 2021......................    100 79 10 0 0 61 9 9 9 1 August 2022......................    100 73 9 0 0 56 7 7 7 1 August 2023......................    100 67 8 0 0 52 5 5 5 1 August 2024......................    100 61 7 0 0 46 4 4 4 0 August 2025......................    100 55 6 0 0 41 3 3 3 0 August 2026......................    100 50 5 0 0 35 2 2 2 0 August 2027......................    100 44 4 0 0 29 2 2 2 0 August 2028......................    100 39 3 0 0 23 1 1 1 0 August 2029......................    100 33 3 0 0 16 1 1 1 0 August 2030......................    100 28 2 0 0 9 1 1 1 0 August 2031......................    100 23 2 0 0 1 1 1 1 0 August 2032...................... 86 19 1 0 0 0 0 0 0 0 August 2033...................... 69 14 1 0 0 0 0 0 0 0 August 2034...................... 52 10 1 0 0 0 0 0 0 0 August 2035...................... 34 6 0 0 0 0 0 0 0 0 August 2036...................... 14 2 0 0 0 0 0 0 0 0 August 2037...................... 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   27.1 19.2 5.5 2.9 1.6 15.1 6.9 6.9 6.9 4.7 S-20