The cat is one of those cheapy ones from auto zone.I am going to replace with another and change the oil,plugs,rotor,cap,and wires.The motor has about 200 thousand miles,maybe I will just do a rebuild and go from there.I thought the motor was doing pretty good though ,just a little puff of smoke at start up,but drives GOOD ,and gas mileage is fine. Anyone have a link for a good compression tester.I need a good quality one.I think I need to check the compression before I go any further.