I have not tried 0323a or 205mod yet. maybe other c-hing will know.
but from another website, one version has better punch while the other version has better top speed in mod racing, but i forgot which is which.
no problem.... actually hobbywing DID NOT give a clear instruction on how to upgrade the LCD box and ESC. I learn all this from another website and I just want to share with RC friends in HK! haha Happy RC'ing!!!
Some people push the limit and use 8.5R or 6.5R ... if you gear it correctly and reduce timing, you can run these motors, but it will stress the ESC a lot more and will burn the ESC easily. So try at your own risk.