Anyone who has ever seen the inside of a higher mileage fuel injected engine (even port injected) can see how a catch can might benefit you. Sure, the backs of the intake valves are clean, but port injection does nothing to prevent build up upstream of the injectors. Does that build up may affect anything that you notice? Probably not. But it has to have some kind of effect on performance and fuel economy, however minor that may be.
Nonsense. There will be not even a minor effect on performance on the 5.7 Hemi. The the intake stroke will draw any microscopic droplets of oil vapor from the PCV system directly to the values where large quantities of gasoline is being injected.
But again, how does someone else's decision about installing a catch can affect you?
It's a fallacy to pretend like the only reason someone should advance an opposing view is because the other person's views impact them directly. The value of most opposing views is on these kinds of forums is to give other people both sides of a story to make an informed decision.
I'm certainly not advising for or against them.
You absolutely are but you are just not very good at supporting your position. If not advising for them, what does your quote "
Anyone who has ever seen the inside of a higher mileage fuel injected engine (even port injected) can see how a catch can might benefit you." mean? In reality, anyone who has ever seen the intake manifold or top of the head exposed to air from the intake manifold in a higher mileage 5.7 Hemi realizes a catch can would serve no function whatsoever.
If people are as gullible as you say that's on them. You should always do your own research when considering doing something some mentions in a forum environment.
People use internet forums as part of their research; that's why it's important to provide opposing views.
You in fact are the one advising against them. You have your reasons for not having one, which I am perfectly willing to accept as your choice. See how that works?
I am absolutely advising against them as they serve absolutely no value in the 5.7 Hemi. I have no need to wait and see how it works as I already have. I'm currently driving my 4th Hemi Ram since 2003 and I put over 180,000 miles on the first one. It still ran like a new truck. Also, source after source, unless you read marketing material, says catch cans have no benefit in a normally aspirated port injected engine.