9120 & 8120 are not the same machine as they have different motors. 9120 has a 12.9l and 8120 has 10.3l. Good one i like to talk about is the 9.0l JD. For instance, an S660 & S670 are the same exact machine. All JD does is puts a software in the 660 to limit the horsepower you can use. So now lets just say you are in the market for a JD combine. Would you rather pay 20-30k more for a 670? Or have the option to buy a 660 for 20-30k less and have us open up that software to become a 670? In this case you just saved 20-30k and paid us a tenth of the price to turn that 660 into a 670. Steinbeaur chips are handy. Pros and cons to both. As a farmer myself, I won't run any more chips. I must have been the unlucky one with all the problems. In all honesty, remapping the ecu is better for the machine itself. Believe it or not, we take off hundreds of chips every year. I don't expect you to change your ways of how you farm but with the way farming is changing since the last few years, farmers are trying to find the best ways to make their operation as efficient as possible.