Its an aussie term and its called a dose pipe, Its just a pipe from the turbo to the air filter and simply acts as a loud speaker that resonates the sound of the turbo compressor surge, turbo chatter, or you may know it as wastegate chatter (even though the later is wrong!) in an audible fashion. They mean it as "give me a dose of turbo noise or chatter). It has to be made of a metal material like steel rather than a samco hose or silicon type pipe it really is just for affect and serves no purpose other than that, but I do like the sound!