The noise you hear in a video with the microphone right under the exhaust is the sound that the vibration of the exhaust tubes itself makes. You can hear it inside the car and from a very short distance away from the car (ie, standing next to it) but you cannot hear it AT ALL from a distance. It doesn't "project" any sound out of the exhaust opening proper. I have videos of me with the Nismo exhaust + long tube headers (no cats) ripping down a straight @ ~125MPH and you can't hear the exhaust at all. Zero noise. lol Inside the car was a different story.
Glad you like how it sounds on the inside of the car, though.
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