If you’re going to keep the junk restrictive square air box you also need to keep the snorkel that goes in the hole in the frame, and with a 2 speed usually its the smaller size one and you must use exact correct jet per hp,
(All that bull crap just to go way slower is so stupid I’ll never understand why people still use those stupid pieces of plastic)
I hate the square airbox/all Puch stock airboxes and most other brands too.
I put them in the recyclable bin by the 5 gallon bucket fulls for those are the restrictor/governor of most mopeds,
I use an aftermarket Mesh filter and most times an exhaust that has a chamber in it too, I jet accordingly and never look back,