Percentages of Original Class Principal (or Class Notional) Balances and Weighted Average Lives Security Group 1 PSA Prepayment Assumption Rates Distribution Date Classes FA, FB, FC, FI, GA, GB, GC, GD, GE, GH, GJ, GK, GL, GM, GN, GT, GU, GV, GW, GX, PO, SA, SB, SC, SG, SH, SJ, SN, ST, SU, SV, SW, SX, SY and YS 0% 100% 270% 300% 550% Class IF 0% 100% 270% 300% 550% Classes JA, JB, JC, JD, JE, JH, JL, JM, JN, JP, MI, MO and SM 0% 100% 270% 300% 550% Classes KA, KB, KC, KD, KE, KH, KI, KL, KM, KN, KO, KT and SK 0% 100% 270% 300% 550% Initial Percent ..................    100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2008................ 99 97 94 94 90 0 0 0 0 0 100 100 92 90 78 99 96 96 96 96 December 2009................ 98 92 83 81 69 0 0 0 0 0 100 100 74 69 33 97 88 88 88 88 December 2010................ 97 86 69 66 46 0 0 0 0 0 100 100 53 45 0 96 78 78 78 71 December 2011................ 96 80 57 54 30 0 0 0 0 0 100 100 36 27 0 94 68 68 68 47 December 2012................ 95 74 47 43 20 0 0 0 0 0 100 100 25 14 0 92 59 59 59 31 December 2013................ 94 68 39 35 13 0 0 0 0 0 100 100 17 6 0 90 51 51 51 20 December 2014................ 92 63 32 28 9 0 0 0 0 0 100 100 13 2 0 88 43 43 43 13 December 2015................ 91 58 26 23 6 0 0 0 0 0 100 100 10 0 0 86 35 35 35 9 December 2016................ 89 53 22 18 4 0 0 0 0 0 100 100 10 0 0 84 28 28 28 6 December 2017................ 88 49 18 15 2 0 0 0 0 0 100 97 9 0 0 81 23 23 23 4 December 2018................ 86 45 14 12 2 0 0 0 0 0 100 94 8 0 0 78 18 18 18 2 December 2019................ 84 41 12 9 1 0 0 0 0 0 100 90 7 0 0 75 14 14 14 2 December 2020................ 82 38 10 7 1 0 0 0 0 0 100 85 6 0 0 72 11 11 11 1 December 2021................ 79 34 8 6 0 0 0 0 0 0 100 80 5 0 0 68 9 9 9 1 December 2022................ 77 31 6 5 0 0 0 0 0 0 100 74 5 0 0 64 7 7 7 0 December 2023................ 74 28 5 4 0 0 0 0 0 0 100 69 4 0 0 60 6 6 6 0 December 2024................ 71 25 4 3 0 0 0 0 0 0 100 63 3 0 0 55 4 4 4 0 December 2025................ 68 22 3 2 0 0 0 0 0 0 100 57 3 0 0 50 3 3 3 0 December 2026................ 64 20 3 2 0 0 0 0 0 0 100 51 2 0 0 45 3 3 3 0 December 2027................ 60 17 2 1 0 0 0 0 0 0 100 46 2 0 0 39 2 2 2 0 December 2028................ 56 15 2 1 0 0 0 0 0 0 100 40 2 0 0 32 2 2 2 0 December 2029................ 52 13 1 1 0 0 0 0 0 0 100 35 1 0 0 25 1 1 1 0 December 2030................ 47 11 1 1 0 0 0 0 0 0 100 30 1 0 0 18 1 1 1 0 December 2031................ 42 9 1 0 0 0 0 0 0 0 100 25 1 0 0 10 1 1 1 0 December 2032................ 36 7 0 0 0 0 0 0 0 0 100 20 1 0 0 1 0 0 0 0 December 2033................ 30 6 0 0 0 0 0 0 0 0 84 16 0 0 0 0 0 0 0 0 December 2034................ 23 4 0 0 0 0 0 0 0 0 66 11 0 0 0 0 0 0 0 0 December 2035................ 16 3 0 0 0 0 0 0 0 0 46 7 0 0 0 0 0 0 0 0 December 2036................ 8 1 0 0 0 0 0 0 0 0 24 3 0 0 0 0 0 0 0 0 December 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)  ..................   20.5   11.4 6.1 5.6 3.4 0.1 0.1 0.1 0.1 0.1 27.7 19.4 4.4 3.1 1.6 16.5 7.0 7.0 7.0 4.4 Security Group 2 PSA Prepayment Assumption Rates Distribution Date Class AI 0% 125% 250% 375% 500% Class AJ 0% 125% 250% 375% 500% Classes BA, BC, BD, BE, BG, BH, BI, BK, BL, BM, BO, BX and XB 0% 125% 250% 375% 500% Class BJ 0% 125% 250% 375% 500% Initial Percent ..................                100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2008................                100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2009................                100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2010................                100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2011................                100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2012................                100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 December 2013................                100 100 100 100 94 100 100 100 100 97 100 100 100 100 100 100 100 100 100 97 December 2014................                100 100 100 100 62 100 100 100 100 81 100 100 100 100 100 100 100 100 100 79 December 2015................                100 100 100 94 39 100 100 100 97 66 100 100 100 100 94 100 100 100 96 63 December 2016................                100 98 98 68 26 100 99 99 84 45 100 100 100 100 64 100 99 99 82 43 December 2017................                100 91 91 47 18 100 96 96 74 31 100 100 100 100 44 100 95 95 70 29 December 2018................                100 69 69 34 12 100 85 85 59 21 100 100 100 84 30 100 83 83 56 20 December 2019................                100 52 52 26 8 100 76 76 44 14 100 100 100 63 20 100 72 72 42 14 December 2020................                100 38 38 19 6 100 66 66 33 10 100 94 94 47 14 100 62 62 31 9 December 2021................                100 30 30 14 4 100 52 52 25 7 100 74 74 35 9 100 49 49 24 6 December 2022................                100 24 24 11 3 100 41 41 19 4 100 58 58 26 6 100 39 39 18 4 December 2023................                100 19 19 8 2 100 32 32 14 3 100 46 46 20 4 100 30 30 13 3 December 2024................                100 15 15 6 1 100 25 25 10 2 100 36 36 14 3 100 24 24 10 2 December 2025................                100 11 11 4 1 100 20 20 7 1 100 28 28 11 2 100 18 18 7 1 December 2026................                100 9 9 3 0 100 15 15 5 1 100 21 21 8 1 100 14 14 5 1 December 2027................ 99 7 7 2 0 99 11 11 4 1 100 16 16 6 1 99 11 11 4 1 December 2028................ 92 5 5 2 0 96 9 9 3 0 100 12 12 4 1 95 8 8 3 0 December 2029................ 59 4 4 1 0 79 6 6 2 0 100 9 9 3 0 76 6 6 2 0 December 2030................ 28 3 3 1 0 48 5 5 1 0 69 7 7 2 0 46 4 4 1 0 December 2031................ 2 2 2 1 0 3 3 3 1 0 5 5 5 1 0 3 3 3 1 0 December 2032................ 1 1 1 0 0 2 2 2 1 0 3 3 3 1 0 2 2 2 1 0 December 2033................ 1 1 1 0 0 2 2 2 0 0 2 2 2 1 0 1 1 1 0 0 December 2034................ 1 1 1 0 0 1 1 1 0 0 1 1 1 0 0 1 1 1 0 0 December 2035................ 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 December 2036................ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 December 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)  ..................   22.3    13.3    13.3    10.9 8.3 22.9 15.0 15.0 12.4 9.4 23.4 16.7 16.7 13.8 10.5 22.8 14.8 14.8 12.2 9.2 S-23