Just noticed in the past few weeks that my exhaust sounds lower. I got out and checked and when it revs it sounds fine but at idle it basically makes no noise at all. It used to be pretty loud at idle. I did check after it was warmed up so that might have something to do with it.

edit: it used to sound like this on idle. Now it makes no noise but revs are still pretty loud.

 

Is it aftermarket exh? Doesnt have the infiniti sound.I dont know if you have a leak maybe. Check for leaks.

 

nope stock exhaust and I couldn't see any holes anywhere when I looked under.