Boardwalk Pipeline Partners (BWP) 10-K 2011 FY Annual report

EXHIBIT 32.1

Certification by the Chief Executive Officer

of

Boardwalk GP, LLC

pursuant to 18 U.S.C. Section 1350

(as adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

Pursuant to 18 U.S.C. Section 1350, the undersigned chief executive officer of Boardwalk GP, LLC hereby certifies, to such officer’s knowledge, that the annual report on Form 10-K for the year ended December 31, 2011, (the Report) of Boardwalk Pipeline Partners, LP (the Partnership) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

February 21, 2012

/s/ Stanley C. Horton                                  

Stanley C. Horton

President, Chief Executive Officer and Director

(principal executive officer)