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I recently picked up a 2021 S4. Today I noticed (approx. three weeks after getting this car), the area behind the engine cover, consisting of what I believe to be the downpipe and then the surrounding heat shielding, appearing a bit gold in color. Is this something normal? More specifically, is it normal for a vehicle this new? I have seen other B9 S4's in the past with even a dark gold color in this region but I associated that with extensive use and oxidation over time of such pieces upon repeated heat exposure. I apologize if this comes across as very "rookie" like or uneducated, I never experienced this on any of my prior vehicles. Thank you for any insight you can provide