I don't think facing forward or backwards will have much effect, as the required amount of air has to be drawn in either way, but having a snorkle will greatly reduce the dust intake for the vehicle. The lower to the groung, the thicker the dust. The extra hight is a great advantage.
Out around Alice Springs, we don't generally have alot of water crossings (infact we don't have alot of water!), but snorkles are almost a standard item on 4wd's for reducing dust intake.


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