Does Power Cord Require Burn-In To Sound Good?

Flat Earth Science at best! "The capacity of Humans for self-delusion is apparently unlimited" - Mr.Spock the Vulcan

I definitely noticed the burn in phenomena with my audio quest power cables: monsoon and blizzard

Sometimes they sound worse before they get better. Do what MC sez. Or be sorry for the massive outlay. I think you would have been better served putting the $$ into a fuse for your DAC. If you haven't already that is your constricter. A 2" pipe is ineffectual going into a 1/2" valve

I don’t know what the return policy is, but assuming it’s 30 days, leave it in your system for 2 weeks, listen to a lot of your favorite music and then switch back. You should have a very good idea of whether you’ve improved the sound or not after that. But definitely give it a chance.  And remember, it's not about which cord is "better".  It's about which cord you prefer sonically in your system.  I had a Wireworld Aurora in my system for a while, but I found my old Black Mountain cord sounded better, so I packed up the Wireworld for another day. 

@ryder Welcome to the world of audiophile hyperbole, where even the direction in which a fuse is inserted in its holder can make the proverbial "night and day" difference.
Honestly, the more reviews and posts that you read before actually experiencing an A/B contrast with your own ears, the more disappointed you are going to be by the often underwhelming nature of the result of swopping B for A.
There *are* big differences in this pursuit, typically between two quite different speakers or two quite different amps.  There are plenty of other differences too, but they're on a spectrum from modest to small to minimal to barely perceptible.