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S4 Wastgate noise

I have a 92 S4 with 52k miles on it.  Lately there has been a noise coming
from the engine when I let off the gas pedal after hard acceleration.  Over
the past few thousand miles this noise has been getting louder and occuring
more often.  The dealer told me that it was coming from the wastgate and this
is normal.   I do not like the sound and I don't feel that it is normal. 
After the turbo winds up and I decrease power is when the noise occurs.  The
noise can best be described as a wheezing, discuss type sound.    Does anyone
have a similiar problem?  Is replacing the wastgate an expensive job?  Any
help is greatly appreciated.

Tim Miller
92 S4 TAP Chip