Trying to clean up the engine compartment, and remove the engine/valve cover breather on my Rabbit GTI and get rid of the old cracking hoses, and replace with a K&N breather, but the rulebook says you must use a catchtank... Well, official 'catchtanks' are around $100, can I make my own? Are there any downsides/upsides to removing the stock setup?

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83 Rabbit GTI - future ITB