2005 interview in Jetskinews of Ross Liberty:
Where did you learn to make pipes and to tune PWC? Pretty much every pipe builder I know comes up with pipe specs by trial and error and when we get something that works we try it on every engine we test. For example, we came to the Type 9 pipe by cut and try (about 100 various pipes) and from there we put it on the Polaris Octane. It also worked well on the 800SXR as well but we went with a pipe spec that Darren Hedlund brought with him which was just as good.