| (1)   | The      Report fully complies with the requirements of Section 13(a) 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 operations of the      Registrant. |
|-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|            /s/ Dr. Ralph S.      Cunningham                                                                    |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Name:                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | Dr.      Ralph S. Cunningham |
| Title:                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Chief      Executive Officer of EPE Holdings, LLCon      behalf of Enterprise GP Holdings L.P. |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Date:    August      11, 2008                                                                                                                                                                                                                                                                                                                                                                                                                                 |

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