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 for a little extra mechanical ability.
All of these new features increase power handling from 200-500 Watts depending on the application.
Its just another way of tuning and tailoring your subs to your exact needs.
For those interested in a retrofit... we can only add the aluminum compression plug to the pole during a recone. We can not add the 6 axial cooling channels to an already assembled and magnetized motor. The addition of the aluminum piece will aid in cooling, but at about a 25 - 35% reduction vs having both the plug and cooling channels. The retrofit and plug is $25.