honestly i have never looked into them, well because i honestly never plan on getting into water that deep. but i alsoo dont live where it is that prevelent either.
just from memory, it seems like it would be easy to fab one up. look at your airbox, and then look at the space at the corner of the hood near the windshield - the slats in the hood.
it just seems that you should be able to make one up with some muffler pipe and some rubber gaskets. cut em up....i dont know how to explain, but seems like it wouldnt be that hard. but i would avoid your easy way out....PVC pipe, it looks easy and ...it is easy, but it still looks like it could fail with high engine bay temps (my thoughts )
good luck
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