My open station came from a dairy operation. I assume it was used in the barns where overhead clearance can be an issue. On my cab tractor, the cab roof is higher than the vertical stack is. No issue with the hot exhaust pipe, it has a heat shield on it. The muffler on mine is different from the vertical muffler. The down pipe muffler has the inlet and outlet side by side. The vertical muffler has the inlet and outlet opposite each other.
Been kicking around removing the muffler entirely and going with a straight pipe. The turbo is actually a muffler. Besides, I like the sound of a straight piped turbo charged diesel engine. They make a sweet sound.
Removing the muffler from under the hood would reduce under hood heat as well.