Airbox internals info of Vader/condor 150?

[ProDigit]

Anyone has any info on the internals of the airbox used on the 150cc Grom clones with Lifan engine and PZ27 carburetor?

I want to know if they are restricted, and where.

If I were to drill a hole in it, where would I want to drill it?

I'd prefer before the filter (towards the rear of the bike), so that the air can still be filtered.
On the other hand, if it has a restrictive tube, I want to eliminate that, so that the bike at least will get sufficient airflow.

I need to see the internals, without having to take mine apart.