first we need to know what year 9660STS, the 06's had some updates and a new engine.
when the 60 series came out, the 9660 could keep up pretty well with a 9750STS, around here anyway.
as far as capacity, the 2 machines have the same threshing and separating area, the 97 has about 20 more ponies
when the 60 series came out, the 9660 could keep up pretty well with a 9750STS, around here anyway.
as far as capacity, the 2 machines have the same threshing and separating area, the 97 has about 20 more ponies