MAF failures attributed to oil is more often engine oil fume, not induction related at all. See where the std breather pipe goes back into the intake, adjacent to the DV which blows when venting, and MAF is just a little way up the same pipe.
If using on track, seriously consider a baffled sump tho, as heavy braking will cause the oil to go vertical inside the block straight into the front crankcase breather and PCV sucks it all up under vacuum.... you then turn your 1.8T into a DERV and its not so happy... pink pink pink...
(1ltr of oil @ Donington on mine some years ago right into the intake,. pinked audiobly!! pulled loadsa timing, overheated on EGT's melted its then IHI exhaust housing) - Catch tank will just catch the oil falling out of the engine, so if going on track do both.