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I live in Illinois and we get tested every two or three years and it's just not a visual inspection. They check for hydrocarbon and NOx levels. Since the header without the cat eliminates a cat, it is quite possible that you will not pass emissions; however, I don't know how they do the testing is MASS. The reason I post is just to give you a better idea of what happens in different states. You really need someone from MASS to respond.....sorry buddy.
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Tony
Chicago, IL
2002 Spec V
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