I asked ECS Tuning in USA this very question (they sell a catch can kit). They told me it wouldn't make much difference on the S8.
After getting the carbon cleaning done, I've taken to using Wurth intake cleaner ever thousand miles or so as a preventative measure. I was surprised that, after my first application, 3000 miles after the physical carbon clean, I could feel a difference. That implies that carbon had already began to build up again.
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