lol I know I took that last vid before I lowered it and put on the R/T's. I have the Super 44 14" muffler and it's made from 409 Stainless steel.
Info about 409 Stainless: Grade 409 resists atmospheric and exhaust gas corrosion. A light surface rust will form in most atmospheres; this rust retards further corrosion but makes the surface undesirable for decorative applications. The corrosion resistance is about the same as that of 3CR12 and the 12% chromium martensitic grades such as 410, and inferior to the 17% chromium grade 430.