may be necessary for carrying out the duties of the Inspector General, subject to the provisions of title 5, United States Code, governing appointments in the competitive service, and the provisions of chapter 51 and subchapter III of chapter 53 of such title, relating to classification and General Schedule pay rates. (B) Additional authorities (i) In general Subject to clause (ii), the Inspector General may exercise the authorities of subsections (b) through (i) of section 3161 of title 5, United States Code (without regard to subsection (a) of that section). (ii) Periods of appointments In exercising the employment authorities under subsection (b) of section 3161 of title 5, United States Code, as provided under clause (i) of this subparagraph— (I) paragraph (2) of that subsection (relating to periods of appointments) shall not apply