I have a Micron carbonfiber high mount exhaust slip on, and I was wondering how much is it worth? Also, what do you call that "device" that attaches the pipe to the back passenger peg?

 

If it's in good condition...probably a couple hundred bucks....as for the "device"...it's called an exhaust hanger, if you are talking about a traditional pipe....i don't know if a high mount hanger has another name....

oh and it also depends on for what bike....

 

It seems like you're talking about the bracket that holds the exhaust. Why do you want to know what it is worth? Have your eyes on another exhaust? Looking to sell the old one?