So, I've got these 2NH calipers from an M3 equipped with the Carbon Ceramic Brakes (CCB) setup, and it turns out Akebono doesn't even make pads for them. I'm currently running Dynamic Friction low-dust pads for now, but I've been eyeing Carbotech. I actually called them up this morning, and the lady there gave me the whole rundown on their pads. The pads alone will set me back $563, if they work as advertised it will be worth it, because the 666M wheels take the most time to clean, out of my three vehicles.
