I have a 2012 DT 200 and removed the exhaust to remove the rear tire. Found I also had to remove the plastic fender above the tire and the rear shock completely to get the tire off. When I pulled the exhaust off, it like it was wrapped with graphite tape on the pipe from the engine. Looking at the parts manual, it looks more like a bushing but maybe a graphite tube? Is this the setup? Should have taken a pic of it but didn't. Here is a pic of a piece that came off.