I have been running my F&F tuners and they have been running great. I finally prepped my Camaro and Charger last night (and I was a little afraid this would be the case). They run terrible. The gears don't mesh very well and it seems as though the rear wheels are out of round. The cars are bouncing all over the place. I know some people mentioned bent axels on the JLXT R1s, but these really look as though the hole is not in the center of the wheel. I ran it really slow and stared at the wheel and the axel did not look like it was moving from the center, but the outside diameter of the wheel was moving. I don't know if they re out of round or concentric. I'm sure I will overcome this problem but I am wondering is anyone else having similar problems with the Muscle cars from the F&F releases?