CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND
CHIEF FINANCIAL OFFICER
Pursuant to 18 U.S.C. § 1350 and in connection with the accompanying report on Form 10-Q for the period ended September 30, 2007 that is being filed concurrently with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of Southwest Royalties Institutional Income Fund IX-B, L.P. (the “Company”), hereby certifies that:
1. The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
| 2. | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company. |
| /s/ L. Paul Latham |
| L. Paul Latham |
| President and Chief Executive Officer |
| of Southwest Royalties, Inc., the |
| Managing General Partner of |
| Southwest Royalties Institutional Income Fund IX-B, L.P. |
| |
| November 13, 2007 |
| |
| |
| /s/ Mel G. Riggs |
| Mel G. Riggs |
| Vice President and Chief Financial Officer of |
| Southwest Royalties, Inc., the |
| Managing General Partner of |
| Southwest Royalties Institutional Income Fund IX-B, L.P. |
| |
| November 13, 2007 |
