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Originally Posted by CSG Mike
We make no such claims about the ACE; no header is immune to a O2 sensor CEL unless it is OEM, or fully identically functional compared to OEM (which defeats the purpose).
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My bet is that it CAN be done, even without making fully identically functional. To me it looks, like simply one has to spend LOT of time on comparing/measuring ranges of sensors, expected values/deltas of readings on stock header pre/after cat (if not by unavailable manufacturer data (not just on sensors, but also in ECU tables), then eg. by experiments, for example getting extremes where CEL appears almost immediately, and then choosing middle of range), and then try not blindly add just any of the shelf distancer/defouler/whatever, that will artificially reduce amount of exhaust gases passing through second sensor, to compensate them being not cleaned up by cat, but will reduce to exact required amount for reading being within expected ranges. Of course - it will mean lot of work/time spent on such secondary function instead of concentrating on main things like getting most optimum runners configuration for most performance gains, and given often insufficient available man-hours to dedicate for that one often needs to prioritise which matters most, but theoretically one should be able to customize second sensor placement even without making header 100% replica of stock construction-wise, if decided to concentrate on that.
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Originally Posted by uspspro
This...
It seriously doesn't take that long, it's only every two years, and it's a good chance to inspect your car anyway.
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Not whole world has US MOT inspection rules. Not everybody has facilities and tools to rise car and do header swap DIY. And cost to swap yearly header in service shops, buy new gaskets and possibly change stripped bolts/threads from frequent swaps to stock and back .. i guess total header related costs including swaping cost for few years will soon pass that of forced induction.
No wonder that even while swap back sounds simple, there are many, given choice, wishing to avoid that. Just that choice is not there ..