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I would say that a properly catted downpipe and properly placed O2 sensors could allow you to pass emissions testing. You don't have to have a dyno tune, but you need a good tune which means you need to datalog it and have corrections made to the tune based on your setup. A good tune is worth any amount of money or any distance you have to drive to get it. I would say making the drive to HRI Tuning would be worth it for you.
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