Percentages of Original Class Principal (or Class Notional) Balances and Weighted Average Lives Security Group 1 PSA Prepayment Assumption Rates Classes F, S and SI Classes FD, PB and SD Classes IP, PA and PC Distribution Date 0% 125% 210% 240% 500% 0% 125% 210% 240% 500% 0% 125% 210% 240% 500% Initial Percent ..................    100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 June 2006 .......................... 99 99 81 81 35 100 100 100 100 100 97 88 88 88 88 June 2007 .......................... 97 97 58 58 0 100 100 100 100 100 94 73 73 73 56 June 2008 .......................... 96 96 39 39 0 100 100 100 100 100 91 59 59 59 26 June 2009 .......................... 94 94 25 23 0 100 100 100 100 100 87 46 46 46 4 June 2010 .......................... 93 93 15 11 0 100 100 100 100 66 84 34 34 34 0 June 2011 .......................... 91 91 7 4 0 100 100 100 100 31 80 23 23 23 0 June 2012 .......................... 90 90 3 1 0 100 100 100 100 7 76 13 12 12 0 June 2013 .......................... 88 88 0 0 0 100 100 100 100 0 72 3 3 3 0 June 2014 .......................... 86 84 0 0 0 100 82 82 82 0 67 0 0 0 0 June 2015 .......................... 84 78 0 0 0 100 58 58 58 0 62 0 0 0 0 June 2016 .......................... 82 71 0 0 0 100 37 37 37 0 57 0 0 0 0 June 2017 .......................... 79 63 0 0 0 100 20 20 20 0 52 0 0 0 0 June 2018 .......................... 77 54 0 0 0 100 4 4 4 0 46 0 0 0 0 June 2019 .......................... 75 35 0 0 0 100 0 0 0 0 40 0 0 0 0 June 2020 .......................... 72 12 0 0 0 100 0 0 0 0 33 0 0 0 0 June 2021 .......................... 69 0 0 0 0 100 0 0 0 0 26 0 0 0 0 June 2022 .......................... 67 0 0 0 0 100 0 0 0 0 19 0 0 0 0 June 2023 .......................... 64 0 0 0 0 100 0 0 0 0 12 0 0 0 0 June 2024 .......................... 60 0 0 0 0 100 0 0 0 0 3 0 0 0 0 June 2025 .......................... 57 0 0 0 0 83 0 0 0 0 0 0 0 0 0 June 2026 .......................... 54 0 0 0 0 53 0 0 0 0 0 0 0 0 0 June 2027 .......................... 50 0 0 0 0 21 0 0 0 0 0 0 0 0 0 June 2028 .......................... 33 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2029 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2030 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2031 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2032 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2033 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2034 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 June 2035 .......................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   18.1 12.0 2.8 2.7 0.9 21.1 10.5 10.5 10.5 5.6 11.5 3.9 3.9 3.9 2.3 PSA Prepayment Assumption Rates Class ZA Class ZB Distribution Date 0% 125% 210% 240% 500% 0% 125% 210% 240% 500% Initial Percent ..................    100 100 100 100 100 100 100 100 100 100 June 2006 ..........................    105 105 96 67 0 105 105 105 105 105 June 2007 ..........................    110 110 91 29 0 110 110 110 110 110 June 2008 ..........................    116 116 88 4 0 116 116 116 116 116 June 2009 ..........................    122 122 89 0 0 122 122 122 122 122 June 2010 ..........................    128 128 92 0 0 128 128 128 128 128 June 2011 ..........................    135 135 97 0 0 135 135 135 135 135 June 2012 ..........................    142 142 102 0 0 142 142 142 142 142 June 2013 ..........................    149 149 107 0 0 149 149 149 149 114 June 2014 ..........................    157 157 103 0 0 157 157 157 157 78 June 2015 ..........................    165 165 96 0 0 165 165 165 165 53 June 2016 ..........................    173 173 89 0 0 173 173 173 173 36 June 2017 ..........................    182 182 82 0 0 182 182 182 182 24 June 2018 ..........................    191 191 74 0 0 191 191 191 191 16 June 2019 ..........................    201 201 29 0 0 201 201 201 170 11 June 2020 ..........................    211 211 0 0 0 211 211 189 139 7 June 2021 ..........................    222 186 0 0 0 222 222 157 113 5 June 2022 ..........................    234 117 0 0 0 234 234 129 92 3 June 2023 ..........................    246 51 0 0 0 246 246 106 74 2 June 2024 ..........................    258 0 0 0 0 258 249 86 59 1 June 2025 ..........................    271 0 0 0 0 271 212 70 46 1 June 2026 ..........................    285 0 0 0 0 285 178 55 36 1 June 2027 ..........................    300 0 0 0 0 300 147 43 27 0 June 2028 ..........................    315 0 0 0 0 315 119 33 21 0 June 2029 ..........................    304 0 0 0 0 331 93 24 15 0 June 2030 ..........................    151 0 0 0 0 348 70 17 10 0 June 2031 .......................... 0 0 0 0 0 356 48 11 7 0 June 2032 .......................... 0 0 0 0 0 229 29 6 4 0 June 2033 .......................... 0 0 0 0 0 94 11 2 1 0 June 2034 .......................... 0 0 0 0 0 0 0 0 0 0 June 2035 .......................... 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   24.9 17.2 11.8 1.5 0.2 27.4 23.0 19.0 17.7 10.0 S-22