I am trying to take off/cut off some of the air vent plastic so I can fit a 8" subwoofer, does anyone know how it can be removed without trimming it off?
I believe that is part time of the cars HVAC output, if you install anything around that outlet you’ll destroy the natural airflow of the system. Turn on your HVAC system Heating/ AC and see if air is coming out, if not it could also be a return duct.