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  1. 2014-2018 Mazda 3 Skyactiv Discussion
    Hey guys, Noticed I've been getting this metal grinding / rattle around @1500 rpm. Usually only happens at idle (rev a lil) 1st, or 2nd year. The rattle goes away when after the car has been operating at normal speeds. Based of experience...is this likely a loose heat shield? The sound is...