when changing the air filter in my vr6 i noticed that there is a tapered black plastic pipe in the top of the airfilter housing , my question is, as this is tapered does it mean that it is restricting the amount of air being drawn through it??? I used to ride motorbikes and they would often do a similar thing to restrict the power. So has any one done it and does it make any difference or am i talking complete bo+++cks! :?