Do downpipes deteriorate?

[JShadzi at aol.com]

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Yes, that is very well the noise you're hearing, its not due to
deterioraiton, but free flowing downpipes are noisey.  Don't know what car
you have, but on the 4kq triple DP it makes all kinds of pinging and tanging
noises, kinda like you'd hear on a small block chevy with tube headers.  The
hollow cat does make its share of annoying noises though, definitely address
that and the sound will improve.

Javad

In a message dated 2/20/2003 10:04:31 PM Pacific Standard Time,
skubik at attbi.com writes:

> I thought my ping pang ting tang at idle and worse under throttle were due
> to the hollow cat but now that I get it up on the lift I notice/see/feel
> any
> leaks but the noise seems to surface in the downpipe just where it comes
> down to 2 pieces, do they separate inside after awhile and start making
> noise?
>