I have the vertical pipe coming out of the hood with a backward turn on the end of the pipe to prevent rain from entering the pipe. To me, this is a good design compromise, as it puts the exhaust high enough in the air so that I don't smell it./forums/images/graemlins/grin.gif But as has been previously stated, it does impair your forward vision a bit./forums/images/graemlins/frown.gif
My father owned several Massey Fergusons with the exhaust routed under the tractor and exiting behind the rear axle. This was great as long as you were the driver and did not have to work behind the tractor and as long as you turned off the engine every time you changed implements. /forums/images/graemlins/frown.gif
Most of the newer CUT's seem to have the exhaust exiting from the front of the engine, pointed to the ground at a slight angle and maybe I went for a test drive on the wrong day, but on the 4330 Kubota I test drove, I could not seem to get away from the smell of the exhaust no matter which way I turned in the dealers lot.
I personally like the cab tractors where the exhaust stack is attached to the right front post of the cab structure where it does not impair your vision and the exhaust exits up into the atmosphere. I guess there is no perfect setup or routing for the exhaust, you just have to use the type that best fits what you are going to use the tractor for or you are stuck with what it is equipped with from the factory if there is no other option available.
One thing that will be interesting to see in the future is how the new emissions standards are met by the manufacturers and how they affect that good old diesel smell that we all know and love. /forums/images/graemlins/cool.gif
