Don't you know I don't read anywhere and don't even think about the upstream sensor as I'm buying and installing my headers. Finally remember I need an o2 on my sd headers, rear one deleted, and the thing won't fit due to my firewall. Has anyone tried a c5 o2 sensor or hammering the firewall with the headers still installed? Installation was really something and I'm not trying to go ahead and disassemble and do it all over again. You speed daddy guys have to know an answer to this one
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