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A lot has to do with cost as well, because I know I sure wouldn't want to have to replace a 3-4" exhaust pipe that runs all the way under the tractor on a big deisel, and I sure wouldn't want to breath all the fumes while behind the tractor while hooking onto a wagon or any thing else. They run it straight up to get rid of the heat quickly, to avoid trapping it in places it shouldn't be. Many tractors with the exhaust running underneath have started fires when raking hay, and some gets on the hot muffler. Almost lit up our 165 Massey that way once, and turned it up shortly there after. In short, yes they should all have rain caps on and to me it's a given, yet I'm always truely amazed at how many I see on the country side with out one. Or for that matter, one that's been rusted in a 1/2 up position or bent/broke. If we happen to catch the rain cap and bend it, I'm sure to either straighten or replace it as soon as possible. If it was more feasable to run it under, it would have been done that way. Truth is, it just isn't worth it in MOST sitiations. Put on an extension if it isn't above your head, and make dam sure that the thing has a properly functioning rain cap. Won't have any problems then. Donovan from Wisconsin
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