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I'm not sure what the fuss is in these two spacer/mini-cat threads.
Is the sticking point really just "what does the secondary O2 sensor do?"
Mini-cats and spacers do work do get a car into ready state for emissions, but they only "work" by fooling the primary O2 sensor(s) - they do not actually change the composition of the exhaust gas mixtures present at the O2 sensor's location.
They fix one problem (emissions readiness) while creating another: false data.
The ECU will adjust parameters based on this information, so yes, MHD is correct that you wouldn't want a performance tune trying to adjust critical parameters using incorrect/false data as an input.
If you install mini-cats or spacers, return to the stock map and just drive the car normally (no roll-racing, drag strips, or stoplight-to-stoplight shootouts).
Do that and you'll be just fine.
Do not run mini-cats or spacers on anything other than the stock map.
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