I notice that my Nismo exhaust is much quieter now than when I first got it last week. Anybody else notices this?

It is also possible that I am just getting used to that great rumbling sound. In any event, it still provides a killer behind view

 

I noticed the same thing after I got my exhaust put on. They break in and then get quieter.

 

I think it's because you get used to it. Sometimes I can just tune mine out and other times it seems annoyingly loud.

 

I disagree....
mine sounds as sweet now as it did when I had it installed a year ago. I love the note it puts out.

 

you should hear it from the outside above 4000rpm. it screams. sooooo sweet.

 

i think mine got louder as it got a bit more miles on it as well.

 

Mine Topspeed got quieter after 2 weeks, I think its because the ecu made some adjustment.

 

Mine got quieter too after 2 weeks.

 

i don't see how an exhaust can get quieter over time...that just doesn't make sense to me...i've had mine on now for a couple hundred miles and it seems a bit louder now than before.

 

like DavesZ said, i think you just get use to it after a while. When i had my exhaust installed, it seemed really loud in and out of the cabin compared to stock. Now i don't really notice it as much.

 

The sound of any exhaust will get *slightly* less harsh after several hundred miles due to the layer of carbon deposits along the length of the exhaust.

 

Mine got louder.

 

wouldn't there be a breakdown of the muffler components over time....which in turn would create more sound...