I believe the SpeedSource splitters are made of Jabrock, an ultra high density plywood that is very expensive. I just had to replace mine and used 1/2" BC plywood for the "dive plane" and it looks fine. The spacers that lower it are cut out of 2x material. All that is easy carpentry; the key and the difficulty is that these units are attached to the car w/ 4 double-bolt brackets that are welded on. For a street car Nico's unit looks light, easy to install, and street stylish.