Quote:
Originally Posted by JSH
It is perfectly legal to replace or modify emission equipment if you can certify that the vehicle with modified parts still meets the emission regulations for the year it was manufactured.
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How to have it checked for compliance without a previous EPA or CARB certification might be a bureaucratic nightmare though... And that's what prevented me from searching Brazilian truck engines in junkyards and export them to rednecks who would approach me once in a while asking me to do so.