How Do You KNow When....

one way it to hit them with your palm when they're COLD:D(sometimes works), another is you have a loss of power(feels like the e-brake is on or like your car is full of passengers)
 
Your boost gauge will also somtimes read unusually high if you have driven with the clogged cats. However, driving the car when the cats are clogged is bad, so do not use this as an indicator if you haven't already noticed it.
 
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