Wondering also  about  that.  I know they  had a 450 hp version it would need more cooling. What drove nicer a  8850 or a 8970. I have always heard a 8850 rode very nice,I know my 8650s ride the best off all the rowcop deers Ive driven.  Getting old ,a nice ridding tractor athats not working hard is way less tiring and enjoyable to operate.