I modded my T4S to install larger 3rd party generic round pads (the same diameter Bluedio upgraded the T5 to). The mod is totally reversible, and does not destroy the stock pads. They fit cleanly and look like stock. No glue needed. I'll bet it is possible to do the exact same thing to the T5, to bump that up to larger-than-stock pads too. Using my mod method, you can go up +10mm. So on the T4 I went from 80mm -> 90mm. Assuming the same method works on the T5, you should be able to go from 90mm -> 100mm. And yes, the T6 uses the same 57mm driver as the T5 (and T4, T3, T2, etc). Bluedio developed the driver in-house, and they use the living snot out of it. Personally I wish they used 50mm, because then it would be easy to transplant different drivers. I had to make 40mm-57mm custom spacers out of PVC piping to get the 40mm graphene drivers in 1 of my T3s. It would have been easier if I had access to a 3D printer, but I don't so I had to do it old school.