The material is ABS plastic. It is the same material, I believe, as the original intake just a different color. The pipes will be black.
Here is a link to the video of cutting the first hole. The first link is in my journal and is a more compact file for viewing only part screen. There is some text along with it. The second is 10 MB for the 3 minutes or so and can be viewed full screen.
http://journals.aol.com/johnstranaha...ing/#Entry1640
http://hometown.aol.com/johnstranaha...foldFlange.wmv