With the October prepayment reports due to be released Thursday, Street consensus estimates are that speeds will decline 12% to 15% in September.

Specifically, Credit Suisse First Boston analysts are expecting speeds to generally drop 8% to 15% versus August, adding that smaller dips are anticipated on the 2005 vintage compared to more seasoned counterparts. These expectations are based on mortgage application volumes from Aug. 10 to Sept. 9.

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