emmissions rules regarding mods
then emmissions rules and laws are not then same nation wide or state wide ,depends on the opinion and decesions of the testors or their bosses , some only care if you meet the tail pipe readings ok ,others are strict as to exact equipment on your engine or car , regardless ,if you even modify to help, emmissions they will reject the added unit revertingto old approved way even if emmissions are worse . so, it depends on your state and local,laws and the testors and their bosses . her in oregon we have some cities with emmission testing and some areas and cities without ,,we are free here in Klamath county and Klamath Falls no inspections at all , BUT you are still, under federal law not to remove any emmission eqpt ,,but who would catch you or even care with no tests ? you do haveto be careful about converter removal though. some dealers and shops will turn you in or refuse to work on a rig with it removed .