Shouldnt throw a check engine light.... LTs like Kooks, AR or any of the others should come with the O2 sensors spots and your choice of cats or not....if you get cats, you shouldnt have any problems at all. Unless, you have to get smogged every year. I plan on doing LTs with cats and 2 bullets whenever i get my SS (sometime down the road).
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Future: 2SS/RS M6 Silver Ice Metallic
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