Aftermarket Pre-cleaner Stack for R or 80

This is my first attempt at posting pictures, so hopefully this will work.

This photo should be of an R with an odd precleaner stack. There is also a picture of one on an 80 in the photo section. Does anybody know where these came from? This has got to be aftermarket as I cannot find anything like it in any of the Deere parts catalogs.

I guess if you had one of these you could put a 1/64 scale Farmall in the mason jar like the IHC/Farmall guys do. It seems that every show that I go to somebody has an M with a little Deere in the mason jar. Farmall people sure are a clever lot!

Anyway, I just wondered who might have manufactured this contraption and what advantages it might have provided.

Lets try the picture thing again. There are pictures of both an 80 and a R with this stack in the photo section.

I can't say for 100% sure, but I think that they are 18.4x34 on 18" or 20" rim. That R is unbelievable. This guy only pulls the tractor, no farm work. This tractor weighted down to 10000 lbs is almost unstoppable. The club only pulls a 160' track and at about 90' the R starts to produce more smoke than any steam locomotive I have ever seen. I don't know what he has done to it, but I would imagine that it has much more power than the pto would ever handle on the dyno. He has another R that is a little less bullish, but still very strong.