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I have a pair of O2 sims on my car you can "borrow" if you want. The cats might not be getting up to temp high enough to help work properly. The rear O2's are probably reading fine and it's just not clean enough. Sims or a real tune is needed. The MAC headers are probably better in terms of being emission's legal regarding location of the cats but I don't know if the cats will work any better. I've heard bad things about the MAC cats getting clogged up quickly. I think BTK has the Random Tech cat setup with stock manifolds on his SS and noticed a difference in power without having headers put on. Did you ever get a proper tune on the car?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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