I got 2 resaonable estimates. $290 Now I'm just hoping the cat is the cause of my weird idle and lack of power. Neither place really seemed to even check the cta. They just assumed it was bad. That worried me. I changed teh plugs but no change in the symptoms.
My car does have 155k miles on it.

How did you know your cat was bad?

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1993 Benz-190E-2.6 liter