I want to clean out the air intake system by myself... I want to clean
out the part AFTER the Mass Air Flow (MAF) Sensor...

| Air Filter | MAF | T u b e | ----> This section here
<-------------

So is there something I can spray AFTER the MAF, so I don't ruin it,
and then run the engine... or do I really need to bring my car in? How
much should I pay for an intake system cleaning? Can you use BG
products with Audis?

Erik