stock exhaust - it's unbelievably quiet! Why?

datcipher

So I bought a 2019 with resonant short tails on. Sounded absolutely great....but I'm generally a quiet car guy, and it was a bit loud with warm exhaust and heavy throttle - sounded wonderful at idling, puttering about, or even at highway speeds as long as not going up a hill.

The biggest problem was that there was an annoying buzz at 2900-3400 rpm coming from somewhere - maybe inside exhaust or inside cabin. (sounded like the crossbar was buzzing)

So I drove 7 hours to pick up a barely used muffler from a 2017 owner, and after cops, a son being being taken away on request of the parents, a guy running away with black market cigarettes, long talk with fellow Z owner, I got home at 2:30 am. Road trips are funny things. Today it was put on.

I can't BELIEVE it. I thought these were supposed to be louder cars anyways (compared to regular cars), and the videos I watched had definite cabin noise, and even a bit of gurgle and pop. I HEAR NOTHING. NOTHING! LOL. Almost entirely road noise, no exhaust purr whatsoever, unless I hammer it, and get above 4000rpm.....then I hear mostly the engine droning. On the one hand I'm impressed on the other hand I expected SOMETHING. My stock 3.5 Altima Coupe has more exhaust noise when opened up.

I've read single posts from a few people saying Nissan improved the sound proofing (though rocks still sound like they're inside the cabin!) after 2015. Is this true? Is this why mine is so quiet?