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My car lost the VQ noise completely? Help

About two weeks ago I launched my car for a friend but ended up not going through with it all the way due to traffic. Anyway, after the launch we

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Old 11-12-2020, 12:26 AM   #1 (permalink)
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Default My car lost the VQ noise completely? Help

About two weeks ago I launched my car for a friend but ended up not going through with it all the way due to traffic. Anyway, after the launch we both noticed something strange. That high pitch motordyne shockwave VQ noise we are all familiar with completely changed. My car sounds awkwardly deeper now.

I suspected maybe exhaust leak? Nope. Went to a good muffler shop and they didn’t spot any leaks anywhere.

Maybe a clogged cat? I’m not sure since I don’t have any loss of power and no check engine lights anywhere. OBD-2 scanner found nothing.. the car only has 30k miles and the cats probably have around 15k total mileage as I ran Art pipes for 2 years before switching back to stock cats.

What do you guys think the problem is with the car? (2015 Nismo)
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