5D is the second part to Culture Shock, which is a track from Exmilitary.
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There were no lyrics in this part because this is only an instrumental, but there was a woman speaking which sounds like text-to-speech. The woman was saying "You need to vibrate higher so you can capture the opening of the portal that connects this Earth of 3D to one Earth of 4D or 5D. Going to the 5...", which has the exact quote from this link.
No one knows why Death Grips got this quote from this link.
We will never know.