I read somewhere on here there might be a fused clapton coil head and also a 6 in one coil head. That just seems insane and was wondering if it was just hear say. The ones I know about not are the RTA, the Tri-Coil and the Quad-Coil. These are plenty for me but curious to see what will come out next. I've only used the Tri Coil so far because that was the one that came pre installed.. and I usually run it at 80 watts, which I've never been able to do with any other sub-ohm tank. I can put it up to 100 watts and it still handles it with ease. I'm blown away by this tank, the only downfall is the juice consumption... but when you're putting out as much smoke as any RDA, I can see why it uses so much juice. For anyone who has the TFV4 is there a big difference in vapor production or flavor in the Quad coil vs the Triple coil? I ordered a couple quad coils from misthub as well as some extra triples in case for some reason I find the Quad doesn't work as well. It's hard to imagine how this thing could put out any more vapor than it already does with the tri-coil in there.. hoping to see what the quad coil will be like.. any feedback is appreciated! Cheers guys/gals.