Ive read its from the heat, but I dont think there is much to be done, a lot of guys kinda like it.
Ive noticed the insides of my exhaust getting a bit yellow too, I will do what ever it takes to clean it up, I love the look of nice new shiny polished stainless steel.
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2016 Alpine White M3 (gone)
2019 Alfa Romeo Guilia (Totaled)
2020 Car-less 😁 (no more)
2020 M340
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