08-22-2015, 12:03 PM
I've seen that yellowing in various pictures around here. Seems to be fairly normal. My header collector down beneath has a bit of that color, but my muffler was pretty well un colored when I removed it around 4000 miles. I found that optiglanz cleaner gets rid of it for a while, but it's back now that I'm around 6000 miles. A stainless header polish like Yoshimura Stain Magic might work to clean that up.
