People have modded these RBAs for better airflow and/or to allow use with bottomfeeders. Some have adapted to a verticle coil. Modding a Phoenix means you adapted it, yourself, to perform differently than its stock form.
The three most common mods to the Phoenix are:
Add an o-ring to the male cover threads to allow positioning the air hole
Lightly file the air hole to adjust (increase) the draw
Vertical coil
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