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Swapping out OE cats for hi-flows made a day and night difference on mine. They make the overall sound more aggressive and louder. I've got vids of my exhaust with OE and hi-flows. My only regret is that I didn't have them installed on day one.
first post! i have always chopped the cats out of my vehicles (no inspections in Oklahoma). I'm guessing like my bronco, a check engine light will come on if i cut out the cats. any ideas on how to turn it off?