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... Additionally, Softronic would need to be installed if the headers are replaced with race headers because of the CEL. I believe Softronic DME will eliminate the CEL issue.
I can confirm that the Softronic tune will eliminate a CEL from the O2 sensors.
Absolutely love my '04 Boxster S. Still haven't had a chance to autocross or track it, but I'm dying to try it out.