im changing my inlet manifold and while working out how to fit it i realised i needed a longer vacuum pressure sensor tube. I've got hold of some longer pipe but what is the little piece of plastic in the middle of the pipe? it looks like a small filter but i dont know if it has to be a certain way round or not? and what would happen if i was to put in another one to extend the tubing? I've got an NA but only picture i could find was on a glanza, its in the middle of the green line on that picture? http://i928.photobucket.com/albums/ad124/corofin12345/alan1-1.jpg i cant find anything about it anywhere and before i start taking stuff appart i wanted to know if it needs to go a certain direction thanks Dan