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The Vehicle does not have a blow off valve. so you will never find it.
A4's have no blowoff valve. VW's and Audi's use a completely different setup.
either a forge 004 blow off valve or a forge splitter, a partial blow off valve and partial recirculation valve. which is what i run on my a4. you may be able to find better prices of these somewhere else online, i never checked,
next to the blow off switch
A splitter valve has a blow off valve sound but it redirects the airflow. It combines the features of a diverter valve and blow off in one housing.
It already has a blow off valve on it, and a rather good one.
No, without a turbo, there is no blow off valve. However, if you really wanted to, they have fake blow off valves for sale. These mimic the sound of a blow off valve. It would be an absolute waste of money, but hey, it's your money.
Blow-Off Valve
Blow off valve faulty or expansion tank needed at water heater.
It doesn't
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You could mount it, but there is no pressure to blow off.