The M2 has a 180 bushel bin with 130hp and can support up to a 22' grain head and a 6 row corn head.  The l2 has a 200 bushel bin with 158hp and can support up to a 24' grain head and 8 row corn head.  Depending on how well your corn yields some say that the M2 is or would be better with a four row corn head.  I had an M with a six row head combining about 120bpa corn and it did fine.  The l is almost the same exact set up only it's 10" wider, for more capacity. Hope this is what you were looking for