When I still had the Pro.15 in my T-Maxx I did the carb flip to straighten the throttle linkage. I then had to reverse the thottle/brake servo. A couple days later I was out in front of my house and my RX batteries went low and the fail safe kicked in. Unfortunately i didn't think about re-setting the failsafe after I reversed the servo and the failsafe went WOT instead of applying the brakes. The truck ran into the neighbor's new garage door and put a big dent in it. That was an expensive ($275 for 1 panel and labor to install) lesson.