My experience with my previous S8 was that when I had a new exhaust installed, not only did the exhaust note improve, but you could also hear more growl from the engine from the front.
I did have 100 cel cats installed at the same time so maybe that could be it rather than the exhaust.
One downside to drilling the air box, is that you are sucking in warm air from the engine bay, one of the purposes the air box was put in to avoid the warm air and draw in cooler air from the outside.
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