I'm new to this forum, I have a 99 KX250, and my son has a YZ125. I had been away from the bike scene for many years, but when my son got into riding, I had to get back into it myself.
The KX has Renthal bars PC exhaust, and PC silencer. the YZ has a PC exhaust, and a PC shorty silencer.
We mostly trail ride, and occasionally get to a track.