search man there are threads on this already .. but im not an a s sso here
This new option adds a machined aluminum compression plug to the pole which helps channel all of the air under the dustcap around the coil for better cooling. To aid with this increased airflow we also add 6 axial cooling channels in the top plate. Along with increased thermal capacity comes the addition of an extra spider and a changed spider pack.
All of these new features increase power handling from 200-500 Watts depending on the application.