Any modification of an emissions system is not allowed how ever a hfc should pass if there is no check engine light on because first nj doesnt always check the tailpipe with a sniffer and even if they did a decent hfc would pass since it does work just not as effectively as the stock cat most of the time they just check if the ecu is throwing any codes and with a hfc it really should not be unless its a low quality or cheap one oh and btw you really should use some punctuation in your posts because having a long run on sentence is a pain to read and really annoying k thanks
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