mitsuguy8600

i am pretty new to the evo forum and i can't honestly seem to find this anywhere but i was wondering if any of you guys running around with headers could help me out. how i am going to pass emissions ? everyone i know has told me that it is impossible too unless i revert my car back to stock and i really don't want to take the time to do that. i do have an aftermarket cat i welded on after i put the headers on though i have no clue if it is working. i am tripping the po421 code and have been and i was wondering if there was a way to tune out the car with evoscan or something in order to pass my test. so basically in other words how did all you modded guys beat the ecu ? thanks for any help you guys can give me