On the 300Tdi the installation should be very easy. If the OE hose between the cyclone breather is 1" ID you are laughing. Just cut it and connect the outlet hose of OE breather to Provent Inlet. Connect the OE air intake hose of breather to Provent OUTLET.
For the Provent oil outlet either:
1. Expel to environment (probably not legal)
2. Expel to a catch can
3. Use included one way valve and tap into OE breather sump return line using a T-piece fitting. This is the best way and should reduce oil consumption.
Otherwise looky here --->
Installing the Mann ProVent CCV Filter in a 2004+ TDI-PD
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