Fitch Rates $961.5MM RASC HE Mortgage Asset-Backed P-T Ctfs, Series 2007-KS2.

NEW YORK -- Fitch rates Residential Asset Securities Corporation (RASC) series 2007-KS2 as follows:

--$316.0 million class A-I-1 'AAA';

--$104.1 million class A-I-2 'AAA';

--$106.3 million class A-I-3 'AAA';

--$65.2 million class A-I-4 'AAA';

--$164.4 million class A-II 'AAA';

--$42.0 million class M-1 'AA+';

--$43.0 million class M-2 'AA';

--$20.0 million class M-3 'AA'

--$18.0 million class M-4 'AA-';

--$17.5 million class M-5 'A+';

--$15.5 million class M-6 'A';

--$15 million class M-7 'A-';

--$13 million class M-8 'BBB+';

--$10.5 million class M-9 'BBB';

--$11 million class M-10 'BBB-'.

The 'AAA' rating on the senior certificates reflects the 24.40% initial credit enhancement provided by 4.20% class M-1, the 4.30% class M-2, the 2.00% class M-3, the 1.80% class M-4, the 1.75% class M-5, the 1.55% class M-6, the 1.50% class M-7, the 1.30% class M-8, the 1.05% class M-9, the 1.10% class M-10, along with overcollateralization. The initial and target overcollateralization is 3.85%. In addition, the ratings reflect the strength of the transaction's legal and financial structures and the attributes of the mortgage collateral. The ratings also reflect the strength of the servicing capabilities represented by Homecomings Financial Network, Inc., rated 'RPS1' by Fitch, and Residential Funding Corporation (RFC) as master servicer.

The collateral pool consists of 6,199 fixed-rate and adjustable-rate first lien and junior lien mortgage loans and totals $1,055,128,424 as of the cut-off date. The final mortgage pool is expected to have an aggregate principal balance of approximately $1,000,000,044 and this variance may affect the characteristics of the final mortgage pool. The weighted average OLTV is 82.53%. The average outstanding principal balance is $170,209 the weighted average coupon is 8.5043% and the weighted average remaining term is 354 months. 70.26% of the loans have prepayment penalties. The loans are geographically concentrated in California (16.94%) and Florida (10.13%).

The loans were sold by RFC to RASC, the depositor. Prior to assignment to the depositor, RFC reviewed the underwriting standards for the mortgage loans and purchased all the mortgage loans from mortgage collateral sellers who participated in or whose loans were in substantial conformity with the standards set forth in RFC's AlterNet program. The AlterNet program was established primarily for the purchase of mortgage loans made to borrowers that may have imperfect credit histories, higher debt to income ratios or mortgage loans that present certain other risks to investors. The depositor, a special purpose corporation, deposited the loans in the trust, which then issued the certificates. For federal income tax purposes, an election will be made to treat the trust as one or more real estate mortgage investment conduits (REMICs).

Fitch's rating definitions and the terms of use of such ratings are available on the agency's public site, www.fitchratings.com. Published ratings, criteria and methodologies are available from this site, at all times. Fitch's code of conduct, confidentiality, conflicts of interest, affiliate firewall, compliance and other relevant policies and procedures are also available from the 'Code of Conduct' section of this site.