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Inside colour of exhaust manifold?

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Old 03-27-2014, 06:53 PM
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Inside colour of exhaust manifold?
Odd thread title, I know, but I just installed my mid-pipe today and noticed that the inside of my manifold was a very even shade of white. I thought these cars ran on the rich side before tuning, I figured it would have been quite black in there. It's not something I'm concerned about, just something that caught my eye. Even so, is that normal?
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Old 03-27-2014, 07:42 PM
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Stock tune is leaner, I was seeing 13 AFR under WOT on the OE flash. Thats a normal color.
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Old 03-27-2014, 07:53 PM
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White is normal. It runs rich, but the exhaust is also really hot, and that fuel still gets burnt ... just in the manifold.
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Old 03-27-2014, 09:20 PM
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Yeah, my manifold is ash white on the inside as well as the O2 sensor when I removed it. Should be fine, Lol.

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Old 03-28-2014, 03:28 PM
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Good stuff, thanks guys.
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