Good link Mark. Problem here is that I run dust daily unless wet roads. In my case use sock over snorkel and give it a shake or wash out.

The B series (non turbo of course) diesel in my SWB cruiser, had Donaldson cylindrical filter can on guard with their clear cyclonic pre filter on top. Great job.

Best for catching grass hoppers etc and the dust and just undo and tap out. Would use same pre filter if was considered suitable for turbo diesel application. Any ideas anyone?