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This happened to me yesterday. Check engine came on but the car was driving fine. about an hour lately exhaust started to get louder and louder by the minute. My dumbass didn't check the code before pouring a bottle of cata clean with almost an empty tank after thinking the cats were clogged. I drove about 20 miles got to the gas station then poured seafoam and filled the tank. as soon as I started the car back up leaving the gas station the check engine light went off but the loud sound exhaust is still. I kind of feel like my mpg is going down a bit and sometimes feeling like is not revving of speeding up as before. Is it that cats even with no code? this happened when I had less than half a tank so its been driving like this for about 80 miles. Need help
 
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