Just a thought here. You might also check to see if your exhaust is hitting the cross member in the rear portion of the car. Not all aftermarket exhausts have a great fitment there. I have had vibrations and contact there in the past. Noises do travel around in a car especially metal to metal contact.
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Corsairprime
2014 Nismo #462, GunMetal Grey, GT-R Start Button, AAM S-Line/R-Line intake and S-Line exhaust, Berk HFCs, Osiris Tuned at JoTech
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