Not really, you'd have to block one of the airflow tubes. You could stuff some cotton in there.
Probably the base of the airflow part is press fitted. But maybe it's screwed or glued or welded. You COULD try to give it a bit of a hammering with two pieces of wood to close the gap. Mine doesn't whistle at all and I hate whistling too! I didn't have too much trouble with leaking except for overdripping but I didn't use it that long.
Hmm too bad then. You could write to cigreen or origin vape.
About the whistling, maybe you can stop it by putting something either in the vertical airflow channels or the holes. A tiny "sound dampening object" somewhere in the airflow might be enough to stop the noise. Maybe a piece of stainless steel mesh. I haven't tried this but I read this tip for whistling on a magma clone.
It seems they improved all the weak points that ppl are complaining about
Did they add support for single coil builds?