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Good question. I have a 641D with vertical exhaust and have the same problem driving in the woods. I have a loader on that tractor and sometimes put up the bucket to protect the exhaust stack. Even so, it has got bent back somewhat and doesn't "look right". My other tractor is a 851 gas with under the tractor exhaust. I think it was made that way, and works fine. It is much quieter than the diesel tractor, but it isn't much fun hooking up implements with the exhaust blowing back at the rear. I have thought about replacing the messed up exhaust on the 641D with something more substantial and braced, but with an extension pipe that I can fairly easily remove when there is a clearance problem. It would mostly involve using the existing parts and adding an exhaust system hanger bracket, probably to the hood tin. Rather than going straight up like it is now, I would have a pipe bent to point the exhaust gas up and forward. It might help the exhaust in the face problem I now have if the wind is just right. My riding lawn mower routes the exhaust out more or less forward and I have never noticed any real problem with that system on that machine. I wouldn't want my diesel tractor exhaust going down, because sometimes it shoots some fire out the top if it is working hard and often puts out some sparks--I really have to watch it when it is very dry. But I think it might be worth a try sending the exhaust forward with a gas engine. Just be sure that the exhaust stream will not heat parts that shouldn't be heated and that the pipe doesn't hang so low that you catch it on things you drive over. Remember that the axle can pivot quite a bit too. I would be interested in hearing how it works out for you. Good luck!
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