"Step 6: Fabrication of items. I decided to use plastic and make myself some of those radiator air guides that many people have in aluminum or carbon fiber (please note: the platic I used was a little too thin...I will make them again with thicker plastic). This is real easy to make and cost less than $30 for material. I simply started with cardboard and made templates (measuring like crazy), then transferred those to the plastic and cut it to size...simple as that."