Flowmaster 40's sound better with time?

I don't see how they could. there are metal baffles welded in there. what is there to change other than rust like mentioned earlier. I have never noticed any diffence. some days my borla's seem louder to me than others but I doubt they really are I think it is mental.
 
I put them on my Mach the day after I bought it & after 900-something miles of driving my Flowmaster 40-Series 2 chambers are louder & grow more so each day. Can't wait till I put my LTs & X-pipe on Saturday.
 
UofMfooTbaLL24 said:
I was wondering if Flowaster 2 chambers sound better with time, that's what i've heard before. I dont think theres insulation on them so I was wondering if and why they sound better after having them longer.
they do get louder with time and a little smoother (in my case with a catted X).. I've had them for 2 years, no sound issues or rust

-wade