The exact same thing happened to me back when I owned a C5 Corvette. The exhaust tone changed overnight. Turned out the cats were damaged. Not sure the extent of the damage because I sold the car soon after. I would start with verifying your cats. Hope this helps.
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"That’s when you know you’ve found somebody special. When you can just shut the f*ck up for a minute and comfortably enjoy the silence.”-Mia (Pulp Fiction)
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