[freebeard]

As I suspected a plow share is involved. So plowing is covered. Then what happens when the tractor is used for fertilizing, cutting and windrowing the crop?

The six inch air gap in the system removes the back pressure, then a compressor adds it back?

I am skeptical.

edit:
I don't think I sounded scornful enough.

The exhaust is maybe 3" (typically oriented straight up) and there is a 6" gap. That's 1.5 square feet of exposure to any cross wind at 360°. Maybe the peak of an exhaust pulse would leap the gap but the leading and trailing edges wouldn't.

The re-compressor would have to fight the internal skin friction of all that plumbing. Possibly helped by rerouting everything under the axle to vicinity of the drawbar and running a negative three inch gap to actually create a Coanda Effect.