Best header material?

if you look into a set of stainless, make sure the are a good quality of stainless. Some are being made from a poor quality of stainless that cannot be re-polished after it discolors from heat. Stainless will flow air a lot better than mild steel but, you will also see higher engine bay temps. as well. Mild steel coated will be a lot cooler under the hood because the heat is being held in the inside of the tubes. Witch also helps the air flow a little because the hotter the exhaust gasses are the better they flow. cost is going to be close because of the expense of getting them coated. Hope this helps a little. :glasses7: