I am trying to install a yoshimura exhaust on my 2010 RTS-SE5. I have taken off the original exhaust and was getting ready to put the new one on. It wouldn't fit and when I looked, it looked like there was some sort of ring type sleeve on the pipe from the engine that wouldn't let the new one slide over. Am I to assume that piece comes off? If so how do I take it off? Thanks for the help.