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Put on my new hooker headers and sidepipes this winter and now starting to run the car, test some other mods, etc. (they are the ceramic coated versions, btw).
When I get the car warmed up I see a small glow on a few of the pipes so I am wondering is this bad? I have a wideband AF gauge and the car is running slightly rich. I also have an IR temp sensor and they are reading between 450-650 degrees.
Sure it is. If you see a 'slight glow' and you know it's a tad rich then there is no problem at all. When breaking in a cam & running 20 minutes at 2500RPM, you'll see headers get BRIGHT RED. Doesn't hurt them a bit.