Hi everybody, I have about 46 000 km on my speedster short exhaust pipes, the other day i went out to the shed and noticed that there was black soot(carbon?) in the pipes. I think this is a natural thing happening over time. I hear that this build up can can affect the sound of your pipes (mabe performance too?). So my question to you all is, is there an easy way to to clean out your pipes? Is it nessary? Should this even be happening? Any cleaning products out there? Thanks in advance to all taht reply!