2017 Honda civic si engine noise and comparison. First one is my car which has 600 miles but sounded like this from the get go and gets louder as the rpms increase. Second engine is new with less than 50 miles and is consistantly quiet as the Rpms increase. Followed break in procedure religiously and cycled 93 octane gas twice. I know direct injection motors can be noisy but I feel something might be loose. Let me know what you think!

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