the ehaust pipe is just to connect the filter to the air tubes. some guys use PVC instead. its just a matter of what you find and want to use. It works just as good as the 250 dollar kit. there is a spot in the K&N Filter where there breather line plugs into it. the way it is set up on mine, it is below the air tubes. Some guys plug the hole in the filter and just put a breather filter you can buy from the ricer section at advanced/autozone and put on the breaher line instead of it going into the airfilter.
the red is what i had.
the red is what i had.