Beat that dead horse, beat it, beat it, and beat it some more! Seriously Randy, I am coming to your door for Halloween dressed as a blinking engine light because we know it will scare you to death.
You have made this point dozens of times now. Just the other day you made it again at Miata.net. And again several folks jumped up in that thread and said they don't get the code you got with their normally aspirated performance header installs. At this point the number of owners running normally aspirated with a performance header without having any code issues.... is THOUSANDS of owners. You don't seem to understand that you had something wrong on your install, with your custom wire extension job, perhaps a damaged sensor, or a wire that just never got fixed right, who knows..... Bottom line, I am sorry you never got it figured out and gave up and that a light has caused you so much stress that you feel the need to post about it weekly for the rest of your life. Some people need to stay stock, if a totally 100% harmless light is going to keep you up at night, I suggest avoid the risk and not ever again try a performance header.
We are the only stocking dealer for that PPE header, good unit...and indeed it means less chance of code, particularly if you put the second sensor out past the midpipe converter so that you have two converters between the two sensors (like the stock arrangement). But, I must warn you...that some autocrossers have had the PPE core fail...resulting in that light you hate so much! PPE has changed the design and the updated core materials seem to be lasting much better.....so far. But, there is always risk in trying things that only a few dozen have tried and in the long run it is possible the new PPE core will fail and give you a light. Seriously, if that risk is going to keep you up at night and post about it forever, perhaps it is not for you.
I suggest you try out a different attitude, one that embraces failure! Failure is often the BEST opportunity to learn, and try different things. When something breaks, I consider it an opportunity to improve upon the design. Obviously PPE feels the same. And so does Racing Beat. For example, those early extension wires for the O2 sensors had issues and broke regularly, and we worked with Racing Beat until a company was found that could deliver a much higher percentage of success and reliability. We are also working on the header and I have a new modular version on the drawing board that may, or may not, see the 'light' of day. I intentionally go out and race the snot out of my NCs in a way that few do, with the intention of breaking stuff repeatedly so I can find stuff that needs improvement...and breaking stuff is FUN with the right attitude.