we've had our 9520 chipped for 3 years now and it works amazing, our 9650 combine was chipped performed flawlessly our 9670 is chipped now also, but we did have trouble with bully dog and ts performace chips in it and they all threw codes, so we have a agricultural diesal solutions in it now and it works great can certainly tell a diffrence for sure, gonna be getting one for the 8330 next year also.