A question jumped into my mind today: Why buy a Kayfun (Or a kayfun clone) when one can get the same experience with something like the kanger subtank + its RBA section?
I have both, they (the deck) look about the same. The Kanger is a bit on the "wild"side but the Kayfun is still the flavor king. I like both.
Maybe why bother modifying a K4 to be a big breather, when you can just get a Mini Subtank.
Edit: I missed the boat on this one, some how I'm thinking mini Subtank but my answer for the full sized Kanger Subtank RBA is different. That one is more like a Kayfun than the RBA for the mini vape wise due to the air hole size difference. Actually I have one of those too but haven't tried it much as yet.
Edit: Much later, put builds in both full and mini SubTank RBA heads. On the full sized RBA I did the same build as K4, it works OK but does not compare to K4.
On the mini I did a 1Ω 26 gauge and that one works quite well, I can't really make a comparison to the K4 on this one as it's a wild one. It would be like comparing apples to oranges.
Now to rebuild a disposable head, the reason why I bought them.
Edit: I thought I was done here but I got my Dremel after that full sized Subtank RBA head and got major improvements but still doesn't even compare flavor wise to the Kayfun 4, it will do some decent clouds though for those into that.
The rebuild on the disposable head was a piece of cake, now back to the K4's
