Originally Posted by kalutika
You can't use a scalli mod with a vortex. The mod was designed for a funnel and the vortex was designed to eliminate the need for one. To use a mod with a vortex would be poorly fitted to the bowl and not really do anything.
You have to mod the mod, but it does work like a champ. On the vortex bowl air holes are high on the bowl. Putting the mod on lowers the air holes forcing air all the way to the bottom of the bowl.