Im in aus so there are only 2 feq's at the moment.
My friend bought 2 cars with the same frequency, he read the box saying it has 2 chanels and he thought you could change them between. We all know it wont work
So we were having the best time trying to run 2 cars with the same feq. We put both cars next to each other and drove them. One had a better acceleration and one had a better turning cicle so it didnt turn out like we hoped and they would dive in unison. Also i went to go out into the shed so i could have a drive but stoped and went to the window and started driving my friends from out side. He had no idea what was going on.