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Porsche engines run close breather systems, as they suck the air again in and burn it. I used to have a similar system earlier on my central air filter unit in my 1st 2l Type 4, but after that, I use the filter mounts left and right. It's pretty identical if you route it into the filter tops or into the atmosphere. The filter tops are a bit better, as you still have a small sucking effect on the breatherbox!
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