Intake Question
I personally have spent close to 4 hundred $$ on air filters (BMC CDA & Apexi cone filter). I found out that the BMC CDA was restrictive and running a bare filter was stupid (hot air into the intake not only reduces Oxygen levels to reduce HP but elevates overall engine, oil temps).
IMHO, I eventually bought SCHWINGS VTDA and am very happy with the results. I strongly suggest not to take the top of the OEM filter box and run a cone filter - you will be sucking the direct hot air that is radiating from the engine and radiator, wheras the VTDA's opening is right next to the fresh air coming in from the fender opening.
If you need to do what you are thinking of, do a search. About two years ago a found a supplier that sells TUCAN breather filters for about $8. Be sure to buy the filter that is made for VWs with a 25mm neck. Here is a picture of the breather filter
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