That i cant honestly tell you these are my cousins that he bought new, he will be back in a couple of days he is out boar hunting, you might try bassani web site and look them up to see im just listing them for him. He did say that when he bought them new that he paid $850 for them. I know that they come apart you can break them down if you want for installation, he sold his cobra so he had these in the garage wanted me to list for him.
here is a pic of some that i got of the bassani site. It said that all their headers are made from 14gage steel some are chrome and some are ceramic like these are and that they are guarantee for life, check out the site it will be able to tell you more than i can.