I recently purchased a Two Brothers bolt on exhaust for my 2003 954RR. I was told that no modifications were require to the bike to install this pipe. When I read the instructions that came with it, they show that a cone shaped end of the existing pipe will need to be cut off before the Two Brothers pipe can be bolted on. Has anyone cut this cone off their 954? Is this required for other bolt ons to be installed? Does anyone know what the purpose of the cone is? I am hesitant to cut it off, but really want to install the pipe. I have a friend with a Yosh pipe that did not have to cut it off. Thanks in advance!