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I'm not sure how effective it is on our cars, but on my Nissan when I put a header on it and got rid of the cat, I used a drilled out spark plug antifouler to back the second o2 sensor out of the direct line of exhaust, which was enough for it to think the cat was still working properly and no SES, which is good if all they do is OBD tests when it's time for emmissions. I would assume this would also work well on the GTO as long as you do it for the second o2 sensor on both pipes.
I'm curious how they say the intake fails if it's not throwing the SES light for emmissions related failures. That's at least how it works here.
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