Just put on the Full Two brothers m7 on my 2013 rmz450. Love the sound nice and deep tone compared to stock. Sounds mean. I know there will be some of you saying it's too loud and ruining the sport. I don't ride tracks and in Canada they don't really patrol the trails for noise (at least in Manitoba). Install took 30 minutes without any issues. Still not sure about which coupler works the best. Anyone with this system if they could chime in which coupler they are using or if they remapped?