hey jakeh we have a 2388 with the cab filter in the little door to the right of the cab.
Last year we got sick of it and changed it we got a small donaldson unit with a pre cleaner and put it under the over hang of the big top keeps it out of the rain works well.
Get about 2-3 days out of it in dusty wheat.
The cab filters on my 2188's are terrible - they're constantly plugged, and pull through a ton more dust than the 2 1680's they run next to. Is there an upgrade I'm missing, or an aftermarket/DIY fix for these?