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Why does my exhaust look like this?

babrams3

babrams3

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Hey guys,

Why does my exhaust yellow like this? New cat back system stainless steel. Previous exhaust did the same thing. Running rich?

DEE1EA62-30D2-4136-B279-C0C209A1D4BD.webp
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silverbullet85

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Looks like octane booster like already stated. I ran boostane but never saw any on the exhaust tips.
 
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babrams3

babrams3

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I ran octane boost maybe 20 tanks ago so I have a hard time correlating it to this
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