Then the oil vapour will drip on the manifold instead of being burnt off in the engine.
I use one of these instead as i'm using a silicone elbow with a V6 box.
I heard using a filter can create back pressure and blow your seal? Like I said I heard it, doesn't mean it is true
Never heard that myself. Not sure how a filter can create that level of back pressure, If you keep an eye on it and make sure its not getting clogged up it should be fine.