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Im just curious as to when I might need new Catalytic converters, will they make funny sounds? Would i notice a stronger smell of exhuast?
 

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You'll definitely notice stronger exhaust smells. If they're damaged you might hear rattling within the cats themselves. Your o2 sensors might trigger a CEL also if it's bad enough.
 

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sometimes they come apart and plug up the exhaust. you'll know if it happens because your car will sound more like a helicopter and run like ass.
 

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You might also get a decrease in power since they dont flow as well anymore.
 
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