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age & weird noise

In message <33AC2EA3.20F7@cdicadwa.com> upchurch writes:

> I'm 28 and my 4kcsq makes a weird noise.  The noise sounds like a just
> blew a hole in my exhaust system but it does not happen all of the time.

> Conditions when noise occurs:
> Heavy rain
> Highway speeds (RPM above 3k)
> letting off on throttle
> It does not happen all of time when these conditions are met but I never
> happens in dry weather or slow speeds or when accelerating.

> Does anyone have any idea what's causing this?

Differential cooling of the exhaust is bending it into contact with the 
prop shaft.  Go under the car and examine the exhaust on the prop shaft side 
with an inspection light and mirror.
The cure is to correct the exhaust's position.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club