I went to the mechanic today to figure out what the vibrating noise on my car was. He said that it was the catalytic converter and since the car has less than 80,000 miles on it it is against federal law for him to replace it. He said to take it to a Ford dealer and they will replace it for free. My question is what is the difference between a cat and a catalytic converter, or are they the same thing?? I had the SHO cat and y-pipe installed on my car so if the cat and catalytic converter are the same, what should i do??
