Kingtal0n

No you've just been copying other people

People just copy other people without understanding what they are doing.

You ever seen an engine from ANY factory come with a catch can?

No and you never will. All Engineers know better, it is obvious to them.

Companies will sell anything that people will buy. You can find all kinds of useless garbage for sale on the internet. Just because they make something doesn't mean it has any useful purpose.
A catch can has a place: It temporarily masks the symptoms of a leaking bottom end, so the owner can drive the car while waiting to fix the engine.
Nobody should have so much oil flowing out of their engine that it requires such an external device, can you see now that the additional sight is unwanted, because now it looks like there is a problem with the engine blowing oil.
In other words, when I see a catch can, I assume the engine is bad or broken.
Sometimes people install small 'oil separators' in some places because they fear the oil may reach the intake manifold.
I am not against small devices however you can often achieve the same affect with a slightly longer hose as the hose itself will act as a deposition surface for oil molecules between the crankcase and intake manifold, thus the hose can simply be thrown away and replaced when it becomes full of deposits and it adds very little additional volume to the crankcase and it's pcv system, which is important when you desire a strong vacuum signal response inside the crankcase, it's volume must be minimal to achieve maximum affect. Or effect, which ever

I'm not saying that you shouldn't control your oil system guys. PCV is an oil control system and absolutely necessary. PCV is the most important system on the engine and tied with the oil pump function.
What I AM saying is that connecting a large, stagnant reservoir to the crankcase is absolutely unnecessary, unwanted, and incorrectly implemented most of the time. Even if it is warranted, it is very easy to install incorrectly. If the can does not heat to the boiling point of water, for example, or near that (say 190*F or so) It will obviously begin to collect water since water is a product of combustion and present in blowby gasses, as well as a normal constituent of normal outside air which enters the crankcase when the engine is *OFF*. Try to imagine adding a small container to an oven which is connected to the outside air, and routinely warms and cools each day, and is also injected with water molecules when it is warmed. Those hot gaseous water molecules must cool down and collect to form water. They will seek cold areas to do this. If the catch can is not hot enough (180-190*F+) the water will simply use it as a condensation surface each day as water is injected via blowby gas which all engines produce some of. &c.... check the links I go over this and more below
Additional volume will work against the pcv action, it will help create oil leaks, it will reduce the effectiveness of pcv. And when installed incorrectly, at the wrong height and wrong temperature, it will lead to oil contamination and reduced engine life.