How do the tuneable exhaust systems work (Supertrapp)?
Picture each disk as having little spacers between them, so that when they are “stacked” there is airspace between the faces of each disk. The Exhaust goes out the pipe through those spaces. The end of the exhaust pipe is actually solid (the cap that holds all of ’em on). So, more disks = more ventilation = more noise and (theoretically) more power.