Did the New Gen 2520 come with a factory underslung exhaust?

[AntiqueIron]

As a kid my grandfather had a 1969 gas syncro range 2520. This tractor had an underslung exhaust, but I have never seen another one like that over the years. Was this a factory option, and if so, does anybody know how many were made perchance? Rare bird? Or was this something someone modified up?

Thanks for reading.