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    Dual Exhaust = Bad o2 sensor + CAT?

    I just bought a Greddy dual exhaust system in April of this year, and a few months after the purchase, my CEL went on. I got it checked out twice. First time was related to the O2 sensor, the second time, a few months later, was the CAT. Meineke says the rattling noise that I get every time I...
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