It's a Reshell and 3 drivers upgrade from Unique Melody. Since they said they've never see this headphone before, I have to tell them which driver(s) it was (TWFK x2) and how I want it to be upgraded. I basically tell them I want Knowles CI-22955 added. I want subbass, but stays neutral like the headphone is. And they freaking perfected it!
I paid ~$400, ear impression and shipping costs included.