this is what i posted to someone else when they said they were going to run w/o a cat.


i would think the emissions released would be directly proportionate to the amount of fuel burnt. also the gov. does not try to enforce people putting cats on older vehicles b/c they did not come w/ them from the factory. they were not manditory until 1981. putting a cat on a vehicle which was not made for one would require alteration modification of the fuel/air ratio and/or fuel pressure system in order for it to run efficiently. if you are taking the cat off you are going out of your way to pollute the enivronment and could be making your vehicle run worse. the engine management system is precisely calibrated to deliver optimum gains and efficiency w/ the some amount of back pressure. so taking the cat off is directly affecting all the calibrations and settings from the factory which makes your vehicle run less efficiently and could dampen performance.