well.. he is obd1 so i think he only has one sensor. it easy to remove the cat. all you ahve to do is unscrew the 3 bolts on the muffler end and take the 2 bols off the header end. i had a small pipe for my o2 sensor that i also removed so that the cat could just fall out easier. dont forget to disconnect the o2 sensor, i think its a bad idea to let it hang on the little pipe.