There's lots of discussions with them
here and
here. There's far more if you do a search.
You do not need a catch can on the hose connected to the air intake box. This hose draws in more air that expells the little oil that it does, so more people put in a breather filter. The hose from the PCV valve to the intake manifold is where you would need a catch can.
Depending on your budget and what you like, you can go with the
Greddy Catch Can or the
$20 Catch can setup. My original placement for the Greddy was just on top of the fuse box, behind the airbox. With my BTG strut brace & Airaid air intake, I barely have enough room for the Greddy. So I bought the $20 catch can setup. Unfortunatley, my nephews chipped in to buy the Greddy for me and no matter how hard I tried, I still could not find room for it giving me easy access for maintenance using the Greddy, so I stayed with the $20 catch can setup. I didn't like the look of the brass fittings for the $20 catch can setup, so through extensive searches, I found
Speedway Motors that sold
Straight Chrome Fittings and
90° Chrome Fittings, which I ordered. I also ordered another hose from the PCV valve to the intake manifold, becuase this hose has a nice bend. It would work well for my $20 catch can setup. I also bought some of corbin clamps, which is the same type of clamps used on the hoses on the PT. I plan to redo the setup so it looks more like a stock setup, instead of hack job.
My $20 catch can setup is a little over 1/4 filled with oil, which has only been on for about 5 days. The oil that is collected in the catch cans can be dumped at any waste disposal facility, which is more likely, any place that performs oil changing services. In worse case, you can just recycle the oil back into the engine, which I believe, some people do.