They only use either alumanized or stainless tubing(I can't remember). My cousin knows the guy or guys that own it. I have never been there but hear they are the best in the area. THe owner even had a matching twin set of 78 or 79 ford trucks at one time. I think he only has one of them now.
When I finally get my 72 done and ready for an exhaust I will be going to them if thay are still in business. As of right now I don't see finishing my truck untill 2020.. hahaha..
Its been up sence 2001 and I only got part of the front end torn appart(grill, fenders, hood, and a couple bolts out of the inner fenders)