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<A4> Exhaust popping

I have been encountering exhaust "popping" in my A4Q when decelerating in
first or second gear from between 3000 to 6000 rpms with little or no
throttle.  If I had a pikemup truck, I would be "racking" the pipes.  

Is this situation normal, harmful???  I never encountered this in my 4kCSQ.


Eric Schumacher