Hey people always go on about the fact that a snorkel is used to stop water out of the Air box.... it does have an other us as well, so more reason for having one.
It helps keep the filter cleaner, well thats my thought anyway, this is how I arived at this train of thought,..... were is the Air intake, inside the wing, just above to the left of the wheel on a 300tdi, so as your romping along a dirt track and stiring up that nice big dust cloud, behind you your sucking in all that dust as well from under the wheel arch.
I may be wrong but its an other reason to think about.
I think most know my thoughts on a snorkel are known on here, I would always put one on a landy, The only thing that I would realy knock about the home made ones is their robustness as Plastics used in pipe like drain pipe are not realy robust due to being brittle, and this get worse wit exposure to uv, If you could find a metal pipe I think it would be better, yes you can replace if smashed, but I cant be arsed to do it. The top needs to be fixed.... if i remember you fixed yours now Chris,
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The other thing is most Homemade ones are just thrown on, but there are a few nice lone out there, and thats cause people have taken care with how they done them.
You could always look how a off the shelf one is fitted, make one for £20, then when you got the money up grade if you realy want to at a later date.