So you rode up and shut down and the exhaust was glowing like this?? Your picture suggests to me its still running when you took the photo which is normal but I personally dont feel is necessary and I would shut it down unless you have airflow over the headers.

All my 4strokes will glow like this if I idle them stationary for more than a few minutes and if there is any crud on the headers I will get a burning smell. Awesome in winter after being through the wet pine forests as I love the smell!

Mine will not do this if I just come off a ride and shutdown though...only after extended idle while stationary ie 2-3 minutes plus!! Which is totally normal.

Matt.