Yes, you need an adapter - the 901 attys are more narrow, but I've always found the taste to be superior. I see a lot on the forums about all the Kanger stuff - what is the BCC you talk about? Maybe I should try the Kanger EVOD - I hear good things about that - does that work well with the Ego-twist?
BCC is Bottom Coil Changeable. Kanger's line is the T3 (aka Tabac BCC), now the T3
s (coil costs less), MT3 - same as the T3 except it has a metal skin over the plastic tank - heavier, the evod - has the metal skin like the MT3 but is smaller in size (1.6ml instead of 3ml), Protank - bigger in diameter than the others so you need an adapter for an eGo and is still only 2.5ml capacity.
All have changeable coils at 1.5, 1.8, 2.2, 2.4-2.6 ohms. 1.8 works well with stronger flavors, 2.2 for lighter ones. the 2.4-2.6 is too light for my flavors and the 1.5 is good for coffee/espresso.
All work well with the eGo, eGo clones, eGo Twist, Spinners, etc. Suggest Good Prophets or heaven gifts for the T3/Tabac BCC - it has the 1.8ohm coil already in it. Other vendors put the higher ohm one that is useless for me but you can always get the replacement coils in what ohm you want.
The benefit of the bottom coil and wicking is that it lowers the possibilty of dry hits because the coil is sitting in the ejuice - unlike the top coil types. They tend to run cooler than the top coils but the 1.8 ohm coil can help on that if you like a warmer vape.