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When I say stock I mean without software. Sorry for not posting this. Car had PROcede, Stett CP/tial BoV, K&N Drop In Filter, AR Catless DPs. Now it just has the DPs on. Took out the PROcede to make sure that it was not the cause of the rumble. The car has been tuned since 300 miles. Car has approx 15k now. Tune has been removed for about 300 miles. So its definitely not the tune. Cat codes arent what is causing the issue.
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