im in need of an oil catch tank to relieve crank case pressure and i was wondering if there is any difference between the ones with a breather filter on top and the ones with out a breather filter or do they both do the same job

 

ive searched but found plenty on how to fit em but nothing on the difference between the 2

 

You need a breather filter, unless you are using vacuum from the intake manifold before the turbo. Otherwise, you will not vent the crankcase. I set up my crankcase and valve cover to go to a catch can with filter and it works great.