Here are a couple under shots. The cutouts are 3" thin wall galv steel. The rest of the exhaust is 2.75" 304 stainless. Probly wont see many other cars with 2.75" pipes lol i know the pipes are crooked in the pics. They are fixed now. I have unlimited rotation at the header flange. Everything is 100% welded. 8 bolts pulls the whole system. I will be putting in a x-pipe really soon