First mod on AnyTone AT778uv

Yesterday was the first time that I used the AnyTone AT778uv in my car. Modulation is good, clear but a bit quite.
Not that I had to yell, but louder than a normal volume.

Hmm, isn’t there any modification for this?
Apparantly yes. Check out the site of Kitesurfer 1404 on this subject :

This morning grabbed a 2 mm drill and performed this mod. On air results are not in, but it can’t be worse 🙂