The left over L4600 is $3000.00 more than a current model L3901.
The L4600 is about 8 additional horsepower, over the L3901, a 4 cyl vs 3 cyl. The L3901 has all the new emissions stuff on it while the L4600 does not.
I was originally looking to buy a L3800 but there are n more of them...