I would not run any cheap overseas copies.
I am currently running the S-Car-Go headers and they are the best thing ever. The ticket price on them is a bit steap but heck you drive a Porsche...you get what you pay for.
The O2 placement is critical. If you get headers that are causing a CEL light then you can do the CEL fix with either a resister or adding a CEL fix bung which raises the position of the O2 Sensor so that it recieves less flow.
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