the catback alone won't give you a CEL, neither will the downpipe--not sure about the testpipe though, I have one sitting here in my room though

A high flow cat will still throw a CEL I think, not sure about that one though...most HFCats are just resonators I think, i'm pretty sure they do next to nothing for emissions

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome