Off Road products are manufactured for vehicles that do not drive on the public roads in the USA. EPA vehicle emissions law states that it is illegal to remove Catalytic Converters or change the size or configuration of the factory system (unless there is another same type vehicle with a larger or different configuration) that you are allowed to copy. The EPA gives us some leeway with the size and configuration of our exhaust systems but they don't like you driving on the streets illegally without a catalytic converter on your car. For those of you that don't know it, you can be fined for driving your car on the street without a converter even if you did it yourself. It is a Federal Offense.