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I know what you mean about them not looking, my ‘92 Mustang 5.0 has the factory cats on it still and I had to try a couple times this year. Passes everything except the NOx as it was .05 over the 1.2 limit. I used a bottle of that Cataclean and it dropped to .08, I was impressed.
I put Collector plates on it this year as well…..
Love to get together for a drive sometime, I’m up in Fort Collins.
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