First tractor - Cub 154 LoBoy had exhaust coming back under the tractor low and ending almost under the seat. Gasoline engine with many hours saturated me and clothes with foul-smelling fumes. Sometimes if the wind didn't carry the exhaust in a favorable direction a shower and change of clothes was needed
Ford 1210 diesel wasn't nearly as bad, but could still get very annoying. Exhaust pointed forward and down. When the muffler rotted out I replaced it with a Cherry Bomb pointed up with a flapper on the end. After that the exhaust doesn't bother me at all.
The exhaust on the B7500, the L3200 and now the l4240 all ran forward and down. The L4240 has a cab, and the exhaust isn't something I notice. I don't recall much of anything on the other two.