Catalytic converters, which are responsible for igniting and burning unburned engine exhaust gases, became standard automotive equipment on all cars beginning with model year 1975. Although catalytic converters help to make engine exhaust gases cleaner, they are not without their minuses. What follows is a brief list of the potential benefits of removing automotive catalytic converters.
Cars that have their catalytic converters removed experience an increase in engine horsepower. Catalytic converters create a significant source of engine back-pressure due to the constrictive effects they have on exiting engine exhaust gases. Removal of catalytic converters from cars allows exhaust gases to exit their engines much faster and at higher levels.