Good question and I'd be interested in the answer as I have an S6 with the
2.2L turbo. What may be beneficial is to clean the throttle body and the
hoses leading to the intercooler. In my specific example, there is a hose I
romoved (the michelin man hose) to get at a coolant hose and this had some
residue in it that I cleaned out but other places in the path didn't have
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