2144 and 2166 are same except for engine- 2166 has 8.3 liter like magnums, 2144's have 5.9 liter like maxxums - other than that they are the same machine, except for bin extensions. 2144 spec'ed with 145 bu tank, 2166 has 180 bu tank. put 2166 extensions on it. I heard of a guy in this area who cranked the pump a "little" bit, and runs an 8 row head on a 2144 (put some weight on the back end). This guy runs on lower yielding side hills, which he had to slow down for anyways, so he figured he would run a wider head to get off them quicker. horsepower of 2344 machines is higher than early 1480's......