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The charge pipe and JB4 will not throw codes on your car. The downpipe will if you go catless however the JB4 can clear that. For inspection for the downpipe you'll need to do one of the downpipe fixes listed on this site or spend the money on a catted downpipe. It's your choice in the end but the downpipe and JB4 will wake up the car the most and make it a blast to drive.
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